| 1000 One Chip Mod: A Built-in NVM | This battery backed-up RAM is a miniaturization and functional equivalent of the famous “Hunter” board. It was designed by Mr. Wilf Rigter of the Vancouver, BC T/S User Group. I owe many thanks to Mr. Rigter for inspiring me to write this article, and assisting with technical advise during the construction and refinement of this | Timex/Sinclair 1000 |
| 16K - Fitting it "Under the Hood" | | Lambda 8300, Timex/Sinclair 1000 |
| 16K RAM Inside the ZX81 | This article is adapted from one written by John Bell which appeared in the November 1987 issue of L.I.S.T. It applies most directly to readers who have the ZX81, TS1000, or the PC8300. The last mentioned computer is a somewhat modified copy of the Sinclair computers and has a very similar internal layout. | Timex/Sinclair 1000 |
| 192K ZX/TS Laptop | Reprint from ZX-Appeal. | Timex/Sinclair 1000 |
| 24 Line I/O | The circuit given on the following page is for an add-on board that will plug into the ZX81’s rear connector and provide 24 bi-directional Input/Output lines. These could be used to control music synthesisers, model train layouts, or whatever you wish. Because the ZX81 has 1K resistors in series with the data lines DØ-D7, which | Timex/Sinclair 1000 |
| 24K Internal Non-Volatile Memory | | Timex/Sinclair 1000 |
| 24K NVM Inside | | Timex/Sinclair 1000 |
| 2K to 4K RAM Upgrade - An Introduction to ZX/TS Hardware | | Sinclair ZX81, Timex/Sinclair 1000 |
| 2K-SDP: A Serial Data Port | A system which allows transfer of data between ZX/TS and ТS2068 computers and cassette tape operations in TS2068 format. | Timex/Sinclair 1000, Timex/Sinclair 2068, Type-in program |
| 32K NVM System Revisited | | Timex/Sinclair 1000 |
| 32K SRAM for the ZX81 | | Timex/Sinclair 1000 |
| 40K Non-Volatile Memory | | Timex/Sinclair 1000 |
| 64K Byte Memory Expansion for the T/S 1000 | | Timex/Sinclair 1000 |
| 8-16K Switch for Cheetah 64K RAM Pack | Detailed hardware modification for adding a DPDT switch to the Cheetah 64K RAM pack, allowing the 8-16K address block to be disabled so incompatible ROM cartridges (e.g., word processor modules) can be used simultaneously. Requires cutting two PCB traces (from IC4 pin 14 to the ROMCS edge connector and from IC4 pin 14 to IC3 | Timex/Sinclair 1000 |
| 8K EEPROM Board | Build a non-volatile memory expansion board with the Seeq Technology 8K EEPROM. | Timex/Sinclair 1000 |
| 8K of Very Low Power CMOS RAM In a World Class Computer for Only $0 | | Timex/Sinclair 1000 |
| 8K of Very Low Power CMOS RAM In aWorld Class Computer For Only $40 | Here is a method for installing a Toshiba TCS5S65 PL-15 Very Low Power CMOS SK X B RAM ($40 from Microprocessors Unlimited) in a TS1000 computer. Two of the great advantages of installation are the reduced power consumption (maybe as much as a 30% cut) and the absence of RAM pack wobble and crash. Who | Timex/Sinclair 1000 |
| A Big Keyboard | A DIY project for building a full-size keyboard for the ZX/TS using a bare keyboard board purchased at a hamfest for $15, attributed by context to Bob Ziskind. | Timex/Sinclair 1000 |
| A Cheap and Simple EPROM Programmer | This article will show you how to build an EPROM programmer. Those interested in peripherals for the Sinclairs (floppy disk, electronic typewriters, etc.) can design monitors and controllers for those devices. Eventually you can program independent microprocessors for special purposes. | Sinclair ZX81, Timex/Sinclair 1000 |
| A Cheap and Simple EPROM Programmer | | Timex/Sinclair 1000 |
| A Complete RTTY Transceive System for the ZX81 and Spectrum | From the British Sinclair Amateur Radio User Group Newsletter done by Paul Newman, G4INP. (Reprinted with permission). Here’s a nice system, complete with TU, AFSK, and interface. We are only printing the ZX81 program, send SASE (to W4GHV) if interested in the Spectrum version. A PC board is available from G4INP. The British price is | Timex/Sinclair 1000, Type-in program |
| A Couple of Simple ZX81/Timex 1000 Modifications | Internal 16K RAM using 62256; composite video buffer. | Timex/Sinclair 1000 |
| A Keyboard Interface for Any Timex Computer | For those who do not wish to go into their computer to connect a new keyboard, here is an interface which you can plug on to the rear expansion buss. You can easily add on one of those TI surplus keyboards which are selling for as low as five dollars. This interface uses the same | Timex/Sinclair 1000, Timex/Sinclair 1500, Timex/Sinclair 2068 |
| A Load/Save Switch, Test Tapes, Azimuth Alignment Revisited and Micro Cartridges | | Timex/Sinclair 1000, Timex/Sinclair 2068 |
| A New Life for Sinclair/Timex Computers | | Timex/Sinclair 1000 |
| A Serial Interface Project for the ZX81 & TS1000 | This is the second article of a series dealing with a serial interface with which to connect your ZX81/TS1000 to a printer, modem or other device. Part one dealt with the actual wiring of the circuit; this one will cover the programming required to obtain useful work from the device. (For those who missed Part | Timex/Sinclair 1000, Type-in program |
| A Simple Loading Aid | Plans for a small device to monitor signal levels when loading programs. | Timex/Sinclair 1000 |
| A Sure Cure For TS Wobble | If you’re suffering from this dreaded disease, here’s a simple hardware trick that will have you and your computer feeling tip-top in no time at all. | Timex/Sinclair 1000 |
| A Video Reverse Board | The easiest way to connect your computer to a monitor is to simply take the composite video signal from pin 16 of the ULA (“SCL” chip). Since this isn’t capable of much power delivery, it will only work in the “high-impedance” input setting. If your monitor doesn’t have a Hi/Lo-Z switch, open the monitor and | Timex/Sinclair 1000 |
| A Video Upgrade? | Why? Is the predominant first question. If you find that your computer does its job, but you would like to see it work a lot faster (in SLOW), if your tired of that annoying fast mode flicker, if you have a program longer than 16K of BASIC and want it to run without crashing, then | Timex/Sinclair 1000 |
| Adapting the TI Keyboard to the TS1000 | | Timex/Sinclair 1000 |
| Adapting the TI Keyboard to the TS1000 | | Timex/Sinclair 1000 |
| Adapting the ZX81 Rampack to the TS2068 | Adapt the 1016 ram pack, memory mapped to the DOCK bank. | Sinclair ZX81, Timex/Sinclair 1000, Timex/Sinclair 2068 |
| Add an RS-232 Port to Your ZX81 | Shows how to add a standard communications interface to the ZX81 – an RS-232 serial communications port that will let you access standard printers, modems, and other computers. | Sinclair ZX81, Timex/Sinclair 1000 |
| Add serial port to your Sinclair | It is time for another hardware project: this time a serial interface, for the ZX81, 2068 (and I believe the SPECTRUM). The design is fully hardware and software compatible with the popular TS2050 (TIMEX) modem. As usual, I tried to keep the circuit as simple as possible to make it easy to construct. I have | Timex/Sinclair 1000, Timex/Sinclair 2068 |
| Addendum: A Simple EEPROMER | Update to Paul Hunter’s article on Bankswitching for the TS1000 (TS Horizons part 4). | Timex/Sinclair 1000 |
| Adding A Joystick To The Timex-Sinclair 1000 | Adapt an Atari joystick to emulate the arrow keys. | Sinclair ZX81, Timex/Sinclair 1000 |
| Adding a Joystick to the ZX81 | First part of an article about wiring a joystick to the computer. | Timex/Sinclair 1000 |
| Adding a Joystick to Your ZX81 | Wire a joystick to map to the arrow keys. | Sinclair ZX81, Timex/Sinclair 1000 |
| Adding a Video Monitor to your Sinclair ZX81 | Simple diagram for tapping off the signals going into the RF modulator. | Sinclair ZX81, Timex/Sinclair 1000 |
| Adding On To Gladstone | Many memory expansion boards have been offered for ZX81’s and TS1000s. One of the first to break down through the $100 price barrier was the Gladstone 64K RAM pack. It gave you use of RAM memory from locations 8K through 64K. Its only short coming was that you had to ALWAYS use all of the | Sinclair ZX81, Timex/Sinclair 1000 |
| Additional Byte-Back Memory Pack Notes | Thanks to John Oliger’s NOT M1 decoding circuit, many new and excellent pieces of software are coming into the market place that make use of machine language routines in the 32K-48K (8000-BFFF hex) region of memory. Some examples of these would include Hot Z-II by Ray Kingsley and Memotext in RAM, Version 3, modified and | Timex/Sinclair 1000 |
| An Illuminating Idea | Hardware and software to switch up to four 5-amp loads at up to 110v. | Timex/Sinclair 1000, Type-in program |
| An Improved Joystick | It was interesting to see in page 10 of the 1:1a issue of SyncWare News, a joystick circuit that is a variation of a circuit which I have been using since I customized my Sinclair ZX81 in the summer of 1982. When I moved the ZX PCB in a large keyboard case, together with a | Timex/Sinclair 1000 |
| Announcing: The IKI (An IBM Keyboard Interface for 1000/2068) | The IKI can be used with the ZX80, ZK81, T/S 1000, T/S 1500, Spectrum and T/S 2068 computers. It is compatible with all interfaces for those computers. The IKI works with any IBM XT-compatible keyboard. The keyboard must have an XT/AT selector switch. | Timex/Sinclair 1000, Timex/Sinclair 2068 |
| Another Look at 450ns EPROMS vs the ZX81/TS1000 | Paul Hunter’s comments on using 450ns EPROMs on ZX/TS computers (May83) strike me as true but incomplete. Paul shows how to add a flip-flop to delay the computer by inserting wait states and thus make the computer read slow EPROMS. You can use another chip select scheme to cure access problems without adding circuitry or | Sinclair ZX81, Timex/Sinclair 1000 |
| Autotape | | Timex/Sinclair 1000, Type-in program |
| Bank Switching for the TS 1000, Part 1 | | Timex/Sinclair 1000, Type-in program |
| Bank Switching for the TS 1000, Part 2 | Describes some of the hardware needed for the project. | Timex/Sinclair 1000, Type-in program |
| Bank Switching for the TS 1000, Part 3 | | Timex/Sinclair 1000 |
| Bank Switching for the TS 1000, Part 4 | THE NONVOLATILE MEMORY BANK After constructing the two 16K banks described last month, and experimenting with them, I felt the need for at least some permanent (nonvolatile). Loading a full 64K of memory from tape can be tedious, even with SDS or ZXLR8. So I decided to make one of the four 16K banks a | Timex/Sinclair 1000 |
| Bank Switching for the TS 1000, Part 5 | To start this month’s installment, we will clear up the increased RF interference on the display and discuss alternative power supplies. There have been several articles describing how to interface a ZX81/TS1000 to a monitor instead of a TV. The advantage, of course, is the elimination of RF interference and a much sharper and steadier | Timex/Sinclair 1000, Type-in program |
| Bank Switching for the TS 1000, Part 8 | This is the last instant of this series. Routines to save (and reload) bank data on tape are included in the 2K operating system. These are necessary for back-up and because the memory in most banks is volatile. | Timex/Sinclair 1000, Type-in program |
| Bank Switching for the TS1000, Part 6 | Again this month we’ll start by reviewing comments and suggestions made by some of you who are building a stacked RAM bank like the one described in this series. | Timex/Sinclair 1000, Type-in program |
| Bank Switching for the ZX81, Part 2 | In this section the various options in the menu of the BSOS (bank switching operating system) will be discussed. | Timex/Sinclair 1000 |
| Battery Back-up The EI Cheapo BBU | The circuit shown is the simplest scheme possible to provide power-down protection for your ZX/TS. You just need a battery holder capable of holding six “one-life” batteries (AA, C or D size), a few silicon diodes (GE531, Radio Shack 276-1141, or other 50 PIV, 2A silicon rectifier) and an on-off switch. An enclosure, some zip | Timex/Sinclair 1000 |
| Battery-Backup and Entrycheck | Here is a simple sketch on how you can provide battery backup for your computer. Cost of parts is small, the 2N5193 can be replaced by almost any 3 to 4 amp PNP transistor. Also included is a short routine illustrating the usefullness of the CODE function in devising a “goof-proof” data entry method. As | Timex/Sinclair 1000, Type-in program |
| Beep, beep | Keyboard beeper. | Timex/Sinclair 1000 |
| Beep, Beep | Beep circuit for TS 1000. | Timex/Sinclair 1000 |
| Bits & Bytes | This column will and try to track document the quirks, fixes, and unique modifications done to the Sinclair computers. We finally received a suggested name for this column from Vollie Miller, WB4TDB to whom we are grateful. Let’s hear from you. | Timex/Sinclair 1000 |
| Break Out with This Sinclair Interface | Educate your ZX81 — teach it to talk to your H8 or some other outside device. Includes schematic for a buffered parallel connection and software for both computers. | Timex/Sinclair 1000 |
| Buffering the Data Bus | Why it’s necessary to buffer the data bus when adding peripherals and how to do it. How the resistors on the data bus are necessary to the video signal generator. | Timex/Sinclair 1000 |
| Bug Alert: One-chip NVM | The “One-chip NVM” in SWN 4:1 shows a minor discrepancy between the schematic (Fig. 3) and the pictorials and instructions. | Timex/Sinclair 1000 |
| Build a 64K Dynamic Memory Board | | Timex/Sinclair 1000 |
| Build A Computerized Anemometer Using The Experimenter's I/O Port | This project is the first in a series of articles which will chronicle my ongoing experiments in the development of a low-cost completely computerized weather station making use of TS computers, the Experimenter’s Universal Input/Output Port, and a collection of common household items. I think you will enjoy following my trials and tribulations. After completing | Timex/Sinclair 1000, Timex/Sinclair 2068, Type-in program |
| Build an Uninterruptible Power Supply | Add a small UPS to the TS1000. | Timex/Sinclair 1000 |
| Build your own EPROM blower without blowing a fortune | Because most users of the T/S1000/ZX81 are software orientated, the hardware has been made simple in this design. The software needed to run it consequently will be large and some of it is in machine code. The heart of the design is the 8255 programmable peripheral interface device. This chip has 24 lines of input | Timex/Sinclair 1000 |
| Build Your Own EPROM Programmer and Centronics Printer Interface - Part I | Multi-part article series. | Timex/Sinclair 1000 |
| Build Your Own EPROM Programmer and Centronics Printer Interface - Part II | | Timex/Sinclair 1000 |
| Built In BBU | Yes, folks, there’s plenty of room left in even your tiny “stock” case to include re-chargeable BBU INSIDE THE COMPUTER. This makes it immune even to pulling the plug! My 16K machine has the BBU circuit, exactly as above, “under the hood.” I must say that using AA cells makes things rather tight, and it | Timex/Sinclair 1000 |
| CAI Stringy Floppy Modification for A&J Interface / ESFOA SIG Announcement | Instructions for modifying a CAI Stringy Floppy drive to work with the A&J (4K ROM) interface: one trace must be cut from connector CN pin 7, and a jumper added from CN pin 7 to IC7 pin 26 to supply 5V power from the A&J drive unit. If one A&J drive already powers the interface, | Timex/Sinclair 1000 |
| Cassette Recorder Interface | Build a small interface unit to improve program loading. | Timex/Sinclair 1000 |
| Cassette Tape Load/Save Monitor | | Timex/Sinclair 1000 |
| Centronics Style Port TS-1000 | | Timex/Sinclair 1000 |
| Cheap Power | Surplus power supplies can double a ZX/TS’s load capabilities. | Timex/Sinclair 1000 |
| Circuit Circus | Excerpted from SWYM Newsletter, Seattle Sinclair Users Group. Sync inverter for QL, load fix for ZX81/TS1000, TOS power supply, modem power. | Sinclair QL, Sinclair ZX81, Timex/Sinclair 1000, Timex/Sinclair 2068 |
| Circuit training helps to build good characters | Expansion to allow user-defined characters. | Timex/Sinclair 1000 |
| Clearer Video | | Timex/Sinclair 1000 |
| Computer Weather Station: Part 2 Tell Which Way The Wind Blows | In the last issue’s “anemometer” article, I showed how to build a simple but effective (and cheap) device to tell how fast the wind blows. Now, I will carry on with plans for an equally important device to determine wind direction. This project, as all future “weather station” articles shall be, is intended to be | Timex/Sinclair 1000, Timex/Sinclair 2068 |
| Connect A Composite TTL Monitor to a TS1000/QL | Schematic to connect a TS1000 or QL to a monochrome TTL monitor by extracting HSYNC and VSYNC signals. | Sinclair QL, Timex/Sinclair 1000 |
| Connect a Monitor to the TS1000 | How to connect a TS1000 directly to a composite monitor. | Timex/Sinclair 1000 |
| Connect a Monitor to the TS1000 | | Timex/Sinclair 1000 |
| Connect a Monitor to the TS1000 | | Timex/Sinclair 1000 |
| Connect a Monitor to the TS1000 | | Timex/Sinclair 1000 |
| Convert your T/S,ZX to Color | Build an add-on to connect a 6847 video display generator (same as in Radio Shack Color Computer) to your TS1000. | Timex/Sinclair 1000 |
| Cooling Your ZX81/TS 1000 | | Timex/Sinclair 1000 |
| Creating a Four Port Expansion Decoder | Memory-mapped IO for the 1000 computer. | Sinclair ZX81, Timex/Sinclair 1000 |
| Curing 16K RAM Random Dumping | Practical guide to fixing intermittent memory loss in the Sinclair 16K RAM pack, covering insulator trimming, grounding spring inspection, and capacitor tape insulation, with a step-by-step procedure. | Timex/Sinclair 1000 |
| Cursor Joystick (for the ZX81 & 2068) | Describes how to wire a joystick port for use with a Spectrum ROM. | Timex/Sinclair 1000, Timex/Sinclair 2068 |
| Custom Keyboard Tip | Did you hook up one of those TI keyboards to your ZX81/TS1000? Don’t you wish it had all the Sinclair legends on the keys? Well, if you can find an old membrane keyboard (remember those?) you can cut it up and paste the legends onto the keys with silicone glue. | Timex/Sinclair 1000 |
| Direct Video Mod | Here’s a video reverse/clean-up mod that started as W4MHQ’s “Direct Video Output” in QZX VOL.1 NO. 2. Like W4MHQ’s, this circuit uses a 75451 to do the output switching. The values of the resistors that define the pedestal and P-P video levels of the output were changed to very nearly duplicate the video signal at | Timex/Sinclair 1000 |
| Direct Video Output for the TS1000 | Hardware modification article describing how to add composite monochrome video output to the TS1000 using a single NPN transistor and resistor circuit, connecting at ULA pin 16. Covers differences between Issue One and Issue Three boards. | Timex/Sinclair 1000 |
| Dock Bank Memory for Twenty Cents: Convert a TS-1000 Ram Memory for the TS-2068 | How to convert a 64K RAM pack for the TS1000 to map to dock memory on the TS2068. | Timex/Sinclair 1000, Timex/Sinclair 2068 |
| Driving a Monitor From the T/S 1000 | | Timex/Sinclair 1000 |
| Driving a monitor from the TS 1000 | Reprint of an article from an earlier issue. Transistor-based circuit. | Timex/Sinclair 1000 |
| Driving a Monitor From the TS 1000 | | Timex/Sinclair 1000 |
| Driving a Monitor From the TS 1000 | | Timex/Sinclair 1000 |
| Driving a Monitor From the TS 1000 | | Timex/Sinclair 1000 |
| E-Z Load Modification | Based on the information on the recorder to computer interface for the ZX81 which appeared in the Jan 8 3 issue of QZX, I have experimentally devised the following simple matching network for my machine. It consists of only two parts aside from the connectors and enclosure – a 0.1 or 0.2 uF capacitor and | Timex/Sinclair 1000 |
| Eprom Burner Program | Program to accompany the EPROM programmer described in Sinc-Link v2 n6. | Timex/Sinclair 1000 |
| EPROM Programmer You Can Build, Part II | To use the EPROM programmer discussed last month with the TS 1000/1500, you need to use the program listed here. Because the 1000/1500 does not have IN or OUT, a couple of short machine code routines appear in the REM statement of line 1. Memory location 16514 holds data to be outputted, and 16515 holds | Timex/Sinclair 1000, Timex/Sinclair 2068 |
| EPROM Reader and Burner Uses | Benefits and procedures for reading and burning EPROMs. | Timex/Sinclair 1000 |
| EPROMS Are Alive and Well ... And Living in Redwood City | | Timex/Sinclair 1000, Timex/Sinclair 2068 |
| EPROMS Are Alive and Well... | | Timex/Sinclair 1000, Timex/Sinclair 2068 |
| Error Codes: Revising a Hunter Board to Hold 32k | Correction to “Revising a Hunter Board to Hold 32k” that appeared in T-S Horizons n19. | Timex/Sinclair 1000 |
| Expand Your Timex/Sinclair Operating System | Expansion card with 8K of battery-backed CMOS RAM in the 8-16K range. Part two. | Sinclair ZX81, Timex/Sinclair 1000 |
| Expand Your Timex/Sinclair Operating System | Expansion card with 8K of battery-backed CMOS RAM in the 8-16K range. Part one. | Sinclair ZX81, Timex/Sinclair 1000 |
| Expanding RAM | Replace the 1K RAM in the ZX81 with a 2K static RAM chip. | Timex/Sinclair 1000 |
| Extended Problem | | Timex/Sinclair 1000 |
| Firmware Card | Card to put a 2K or 4K EPROM anywhere in the memory map. | Timex/Sinclair 1000 |
| Fix the ZX-81/TS1000 Loose Jack Problem | | Timex/Sinclair 1000 |
| George Erickson's Ultimate Loading Solution: Batteries | UPDATES has devoted considerable space to improving loading speed convenience and dependability. Disk drives, stringy floppies, and fast load-type programs all contribute greatly to these critical factors. George Erickson, a manufacturer’s representative for Canon micro floppy drives, hard disks, and other computer equipment, uses ZX PRO/FILE to maintain his sales data. Since last November, his | Timex/Sinclair 1000 |
| Get a Better Screen | Several circuits for composite monitor signals from the ZX81/TS 1000. | Timex/Sinclair 1000 |
| Getting Into A BIG Printer | I won’t spend much time or space extolling the virtues of a “big” printer for your ZX/TS computer. Suffice it to say that a full-width printer can be the most useful investment you make since you first bought your computer. Such printers allow you to print full-width text and program listings in a variety of | Timex/Sinclair 1000 |
| Getting More From Each Keystroke | Hints on adding a full-size keyboard. | Timex/Sinclair 1000 |
| Getting the LED Out | | Timex/Sinclair 1000 |
| Green and Black and Read All Over | Connecting the ZX81 to a monitor. | Timex/Sinclair 1000, Type-in program |
| Hacker's Haven Presents: ZX-81 (and 2068) MIDI Interface Project, Part 2 | | Timex/Sinclair 1000, Timex/Sinclair 2068 |
| Hacker's Haven Presents: ZX-81 MIDI Interface Project | | Timex/Sinclair 1000, Timex/Sinclair 2068 |
| Hacker's Notebook: Joysticks | | Timex/Sinclair 1000 |
| Hacker's Notebook: TS 1000 Memory Expansion | | Timex/Sinclair 1000 |
| Happiness is a Converted T/S 1016 RAM That Works! | Addition to two part article in Time Designs in 1986. | Timex/Sinclair 1000 |
| Hardware Buys & Tips | | Timex/Sinclair 1000 |
| Hardware Hints | Offers several solutions for preventing the ZX81 from overheating. | Timex/Sinclair 1000 |
| Hardware Hints | | Timex/Sinclair 1000 |
| Hardware Hints | Two hardware tips: an overheating fix using a steel block on the case (reprinted from EZUG Newsletter Jan/Feb 82), and a fix for memory loss caused by defective solder joints on 7805 voltage regulator pins. | Sinclair ZX81, Timex/Sinclair 1000 |
| Hardware Project | This circuit will simplify loading and saving programs by eliminating ground loop noise without the need to pull out the earphone plug during saving and the microphone plug during loading. | Timex/Sinclair 1000 |
| Hardware Tip: Keyboard Conversion | Use a DIP socket to create connectors for a keyboard conversion. | Timex/Sinclair 1000 |
| Home Control on a Budget | | Timex/Sinclair 1000 |
| How I Made My Fullsize Keyboard | Describes how to connect a surplus keyboard to a ZX81. | Sinclair ZX81, Timex/Sinclair 1000 |
| How to Build an Inexpensive Joystick Interface | Simple circuit and software to interface Atari joysticks to the 1000. | Timex/Sinclair 1000 |
| How to Convert a Surplus WC2050 Modem into an RS-232 Serial Interface for your TS1000/1500/2068 | | Timex/Sinclair 1000, Timex/Sinclair 2068 |
| How to Convert a Surplus WC2050 Modem into an RS232 Serial Interface for your TS1000/1500/2068 | | Timex/Sinclair 1000, Timex/Sinclair 1500, Timex/Sinclair 2068 |
| Improving Timex/Sinclair Tape Loading | Reduce troublesome dropouts and noise problems with a Z-Dubber. Schematic and PCB layout for the Z-Dubber is provided. | Timex/Sinclair 1000 |
| Increase Your Memory | Replace the internal RAM chip in a ZX-81 or TS 1000 with 8K static RAM. | Timex/Sinclair 1000 |
| Input/Output: A Big Keyboard | Instructions on interfacing a full-size keyboard to the TS 1000. | Timex/Sinclair 1000 |
| Install A Reset Switch | | Timex/Sinclair 1000 |
| Installing a UHF Modulator | | Timex/Sinclair 1000 |
| Interface a Joystick to Your TS-1000 or ZX81 | | Timex/Sinclair 1000 |
| Interfacing a Real Printer to the Timex/Sinclair 1000 | Author uses the CAI/O interface board to connect his upgraded MicroAce to an Okidata Microline 92. | MicroAce, Timex/Sinclair 1000 |
| Interfacing Tips and Troubles: Interfacing the Sinclair Computers, Part One | Bryan Lepkowski of Mechanicville, New York wrote in and wanted to know what changes would be required to adapt the VIC-20 EPROM programmer (The Computer Journal Vol.II, No.4) to operate with the Sinclair TS2068 color computer. As I attempted to answer his question, I realized two things. One, the question cannot be answered in a | Timex/Sinclair 1000, Timex/Sinclair 1500, Timex/Sinclair 2068 |
| Interfacing Tips and Troubles: Interfacing the Sinclair Computers, Part Two | Last month in Interfacing Tips and Troubles we presented part one of a two part article on interfacing the Sinclair computers. In part one we looked at the hardware required for a simple interface, and explained how to protect memory space for storing machine language programs. This month in part two, we will present the | Timex/Sinclair 1000, Timex/Sinclair 1500, Timex/Sinclair 2068, Type-in program |
| Interfacing Tips and Troubles: Memory Mapped I/O on the Sinclair ZX81 | Memory-mapped IO on a Timex/Sinclair computer. | Sinclair ZX81, Timex/Sinclair 1000, Timex/Sinclair 1500, Timex/Sinclair 2068 |
| Interfacing with Brother's EP44 Typewriter | | Timex/Sinclair 1000 |
| Internal 64K RAM for the TS/ZX | Upgrade to 64K with a 43256 static RAM chip and some memory decoding. | Timex/Sinclair 1000 |
| Introduction to Computer Control | Introduction to using the TS 1000 as the basis for a robot. | Timex/Sinclair 1000 |
| Just for Thought | | Timex/Sinclair 1000 |
| Keep Your Cool | Techniques for improving cooling in the ZX81 and its RAM pack. | Timex/Sinclair 1000 |
| Key Board Mania, Part 3 | | Timex/Sinclair 1000 |
| Keyboard Alternatives | Alternatives to the Sinclair keyboard: overlays, beepers, full keyboards. Plans for wiring your own keyboard and list of keyboard alternative vendors provided. | Sinclair ZX81, Timex/Sinclair 1000 |
| Keyboard Conversions for ZX/TS | Overview and how-to attach a full-size keyboard to a ZX81 or TS1000. | Timex/Sinclair 1000 |
| Keyboard Interface for the TS1000 and the 2068 | | Timex/Sinclair 1000, Timex/Sinclair 2068 |
| Keyboard Mania - Part 6 | Reprinted from the July-August-September Summer Mega Issue of LIST. | Timex/Sinclair 1000 |
| Keyboard Mania, Part 1 | | Timex/Sinclair 1000 |
| Keyboard Mania, Part 1 | | Timex/Sinclair 1000 |
| Keyboard Mania, Part 2 | | Timex/Sinclair 1000 |
| Keyboard Mania, Part 2 | | Timex/Sinclair 1000 |
| Keyboard Mania, Part 3 | | Timex/Sinclair 1000 |
| Keyboard Mania, Part 4 | | Timex/Sinclair 1000 |
| Keyboard Mania, Part 4 | | Timex/Sinclair 1000 |
| Keyboard Mania, Part 5 | | Timex/Sinclair 1000 |
| Keyboard Mania, Part 5 | | Timex/Sinclair 1000 |
| Keyboard Mania, Part 7 | | Timex/Sinclair 1000 |
| Keyboard Mania, Parts 6 & 7 | | Timex/Sinclair 1000 |
| Larken & Hunter | Add a switch to the Hunter 8K memory board so it will work with the Larken DOS ROM, which occupies 12-16K region. | Timex/Sinclair 1000 |
| Letter from Edward Loxtercamp | Offers help to users who want to build his RS-232 interface. | Timex/Sinclair 1000 |
| Load and Save Easier with LED VU Meter | | Timex/Sinclair 1000 |
| Machine Code Development System For Your Timex Sinclair 1000 | Turn your Timex Sinclair 1000 or Sinclair ZX81 into a high-speed, machine-code development system. | Timex/Sinclair 1000 |
| Machine Code Development System For Your Timex Sinclair 1000 Part II | Turn your Timex Sinclair 1000 or Sinclair ZX81 into a high-speed, machine-code development system. | Timex/Sinclair 1000 |
| Machine Code Execution Above 32K | Execute machine code with addition of one chip to create new logic signal. | Timex/Sinclair 1000 |
| Machine to Machine Transfers | | Timex/Sinclair 1000 |
| Machine to Machine Transfers | | Timex/Sinclair 1000 |
| Make Your Own 2068 & TS1000 EPROM Progammer | Here is a project that will let you “burn” (program) EPROMS using your computer. It will handle either the 2764 type (8K bytes) or the 27128 (16K) EPROMs. | Timex/Sinclair 1000, Timex/Sinclair 2068 |
| Making the 1000/ZX81 Even Better | | Timex/Sinclair 1000 |
| Making the T/S 1000 & ZX-81 Even Better | | Timex/Sinclair 1000 |
| Marathon Operating Times for the Timex-Sinclair | Techniques for preventing overheading-related shutdown. | Timex/Sinclair 1000 |
| MAX 1000: Make the Most Popular "Mods" Compatible On Your TS1000 | Collection of upgrades/modifications to the 1000. | Timex/Sinclair 1000 |
| Mem Saver | | Timex/Sinclair 1000 |
| Memopak RAM and TS 2040 Printer Compatibility | | Timex/Sinclair 1000 |
| MIDI | | Timex/Sinclair 1000 |
| Mini-Motherboard | | Timex/Sinclair 1000 |
| Mod to Use Hunter RAM with > 32K | Hunter boards require a modification to work on systems with more than 32K RAM. | Timex/Sinclair 1000 |
| Monitor Output for the TS-1000 & 1500 | I have had numerous requests on how to add direct video to the TS-1000 & TS-1500 computers so as to drive a composite video monitor. This has been covered many times in the past in other newsletters and magazines, but I feel that for those who are just now starting to use their computers and | Timex/Sinclair 1000, Timex/Sinclair 1500 |
| More 16K RAM Solutions | Brief hardware tip reporting two defects found in Sinclair 16K RAM packs: cut leads in the internal ribbon connector causing intermittent contact, and a misaligned grounding strap shorting the +5V and +9V supplies when the case is squeezed. | Timex/Sinclair 1000 |
| More on Z-XLR8 | This is not intended to be a “review”, will leave that exact detail to your fine reporting. I do want to offer encouragement to those who may be a little reluctant to try the “EPROM version.” Believe me, it’s the only way to go. | Timex/Sinclair 1000 |
| More On-Board Memory For ZX-81/TS-1000 | Options for internal memory upgrades to these computers. | Timex/Sinclair 1000 |
| New Locations for M/C Routines in a 64K RAMpack | Small hardware modification to allow machine code programs to run in the 32-48K RAM space. | Timex/Sinclair 1000 |
| New Locations for M/C Routines in a 64K RAMPack | | Timex/Sinclair 1000 |
| New Locations for MC Routines in a 64K RAMpack | | Timex/Sinclair 1000 |
| Ni-Cad Charger | Constant current charger for TS 1000. | Timex/Sinclair 1000 |
| On Board Computer | While for many years the upper echelon of the aviation community has enjoyed the benefits of high-tech devices, general aviation has been slow to adopt the now ubiquitous computer into their cockpits. With the advent of the personal computer, cockpit implementation of the small computer is now both economically feasible and practical. This article examines | Timex/Sinclair 1000 |
| One Chip Mods | Modify memory-mapped Byte-Back modules to work better with an expanded TS1000. | Timex/Sinclair 1000 |
| One Chip Mods: Recycle that 16K RAM pack | Instructions on how to alter a standard 16K RAM pack to work as 2 8K banks in the 8-16K region of the TS 1000. | Timex/Sinclair 1000 |
| One Chip NVM Correction | Improved schematic for design from July/August 1986 newsletter. | Timex/Sinclair 1000 |
| One-Chip Mods: Built-in NVM | 8K RAM mapped to 8-16K region, internal to the computer. Compatible with Hunter board. | Timex/Sinclair 1000 |
| Paging Control | One of the advantages of building a ZX81 from a kit was that you got a schematic with the manual, and you gained some insight into how the machine worked as you put it together. It was evident, for example, that the computer was missing some memory from 8K to 16K — an area transparent | Timex/Sinclair 1000 |
| PET ASCII Output Program for the Timex/Sinclair ZX81 | This article describes a project which may be useful for anyone desiring to use software for the ZX81, TS1000 or TS1500 on a different computer. The program version presented here is designed to convert Sinclair BASIC programs into ASCII text which can be sent from the Sinclair computer to the serial port of a Commodore | Sinclair ZX81, Timex/Sinclair 1000, Type-in program |
| Poor Man's MODEM | | Timex/Sinclair 1000 |
| Poor Man's Modem | | Timex/Sinclair 1000 |
| Poor Man's Modem | | Timex/Sinclair 1000 |
| Port Project #1: Data Communications Between Two Computers | This first project gives you the basis of a very useful application involving I/O ports–communicating between two computers. | Timex/Sinclair 1000, Timex/Sinclair 2068, Type-in program |
| Port Projects: Get the LED-OUT | In any number of monitoring and/or control uses for your ZX/TS, you may find that using a TV set to check on your system is inconvenient or impractical. This would be so, for example, in outdoor or dirty environments or when you simply wish to check the status of one or two system parameters without | Sinclair ZX81, Timex/Sinclair 1000, Timex/Sinclair 1500 |
| Power Supplies | | Timex/Sinclair 1000 |
| Pseudo-ROM | | Timex/Sinclair 1000 |
| Pseudo-ROM | The dot patterns for the displayable characters are held in a table in ROM, in locations 1E00 to 1FFF hex. The patterns are stored in order of the character CODE, 8 bytes being used for each character, corresponding to the 8 TV scan lines used to build up each character on the TV screen. The | Timex/Sinclair 1000 |
| Quick and Easy Video Output for the ZX81 and TS1000 | | Timex/Sinclair 1000 |
| RAM Pack Repairs | In this article, I will discuss some of the problems that can occur with the 16K RAM pack for the ZX81 , TS 1000, and TS 1500. As I said in my last article, RAM pack ‘wobble’ is the most common problem and can be cured by cleaning the connector, raising the RAM pack off | Timex/Sinclair 1000 |
| RAMKIT: Build your own 64K RAM | Build the RAM module with parts from Gladstone Electronics | Timex/Sinclair 1000 |
| Repeat Key | | Timex/Sinclair 1000 |
| Reset Switch for ZX81 and 2068 | | Timex/Sinclair 1000, Timex/Sinclair 2068 |
| Reverse Video | | Timex/Sinclair 1000 |
| Reverse Video Monitor Driver | This circuit, using the concept published in Electronics, drives a video monitor and reverses video on demand. | Timex/Sinclair 1000 |
| Reviews For The Non Programmer | I’ve been struck by lightning and in spite of Zenkar’s diode (see ad) a fuse, a circuit breaker and a grounded outlet, I blew a chip. I think it was the SCL (part of it worked), which brings me to the subject the proper power supply. | Timex/Sinclair 1000 |
| Revised Schematic of Digi-Dubber | | Timex/Sinclair 1000 |
| Revising a Hunter Board to Hold 32K Bank Switchable NVRAM | With HM6264LP-I5 28 pin RAMS at less than $4 each, l have devised a not-too-difficult revision to a Hunter board which will give your ZX81/TS1000 four switchable 8K sections of write-protected NVRAM on the one board. | Timex/Sinclair 1000 |
| ROMPAK | The Rompak cartridge can instantly load programs, such as games or utilities, into memory. The cartridge is memory mapped in the unused 8 to 16k block of memory, and it has an expansion connector out the back, so it can be used with the T/S printer or ram pack. | Timex/Sinclair 1000 |
| RS-232 to Video - The Easy Way | With the trusty ZX81/TS1000 destined for a place in a dusty closet, here’s a way to put it to use in the event you need a video output from a device having a RS232 serial port. Two examples are the HP41C calculator/computer and Tandy’s new Model 100 portable computer. First, to give credit; Charlie Welch, | Timex/Sinclair 1000, Type-in program |
| RS232 I/O Revisted | | Timex/Sinclair 1000 |
| RTTY Send Program & Interface for the Sinclair/Timex ZX81 | One of the things in operating RTTY with non-electronic gear has been the nuisance of identifying. here is a lot or repetition such as the other station’s call, my call, my name and QTH. I often envied tnose that had the new fancy “glass TTY” units that had all of that built in. Well that | Timex/Sinclair 1000, Type-in program |
| Run TS1000 Machine Code in High Memory | This trick was originally published in Syntax Quarterly, Summer 1983. It will allow you to use the 32-48K RAM area for machine code, if you have the Memotech or JLO 64 K boards (and maybe some others, but not the Byte-Back UM). | Timex/Sinclair 1000 |
| Say What? | Simple speech recognition hardware and program for ZX/TS computers (with at least 16K RAM). | Sinclair ZX81, Timex/Sinclair 1000, Downloadable, Type-in program |
| SCLD Character Select Switch Schematic | Technical schematic (DRW No. SRC 0549) showing the wiring for a character select switch for the Sinclair ZX81 SCLD chip, allowing selection between character sets. The diagram includes pin assignments for the US connector and the SCLD chip, with an alternative IC noted. The listing was created 9/17/87. | Timex/Sinclair 1000 |
| Seeking a Cheap Output? | This article describes how to construct your own simple and inexpensive output line. The project is ideal for low-end micro owners whose computers lack output ports. Interfacing techniques given for the Timex Sinclair using phototransistors and the TV. | Timex/Sinclair 1000 |
| Signal Booster | Use an audio transformer to boost tape signal. Reprinted from Sincus News, May/June 1986. | Timex/Sinclair 1000, Timex/Sinclair 2068 |
| Signal Booster | | Timex/Sinclair 1000 |
| Simple Reset Switch | Instructions and schematic for adding a debounced reset switch. | Sinclair ZX81, Timex/Sinclair 1000 |
| Simple RTTY TU Circuit | This simple RTTY terminal unit provides a TTL output that can be connected directly to the ZX81. Shown is a two position switch to allow for “inversion”. but an additional position is recommended to keep it from messing up tape loading. The LED is used as a tuning indicator and works reasonably well on 170 | Timex/Sinclair 1000 |
| Simple Video Inverter for ZX81 | | Timex/Sinclair 1000 |
| Single-Key Shifted Functions | Describes how to use diodes and integrated circuits to map a single key to a shifted-key function on the ZX81. | Timex/Sinclair 1000 |
| Slave CPU Processing: Applicable to ANY Host Computer | Discusses how to apply techniques described in “Interfacing to S-100/IEEE 696 Microcomputers” by Sol Libes and Mark Garatz to the Timex Sinclair 1000 and 2068. | Timex/Sinclair 1000, Timex/Sinclair 2068 |
| So You Wished You Had Bought a TS2000 | How would you like to have a computer with a color video display of fifteen colors, quality sound, high resolution, unlimited character sets, and a dual joystick interface? How would you like a system in which you do not have to worry about expansion? If you have a ZX81 (or ZX80 with the 8K ROM), | Timex/Sinclair 1000 |
| Software Compatible Joystick | It’s a snap to connect an Atari-type joystick to the ZX81/TS1000; all it takes is direct connection to the keyboard lines. The problem with this is that only certain combinations are possible, and you cannot hook it up so that the joystick controls the “arrow” keys 5-8; as a result, software written for the computer, | Timex/Sinclair 1000 |
| Sound for the ZX81 | A hardware project adding an AY-3-8912 sound chip and joystick port to the ZX81/TS1000 via the expansion bus. Includes BASIC and machine code driver routines (PLAY, MUSIC, SOUND commands via SHREB), schematics, PCB layout, parts list, hex loader, and demo program listing. | Timex/Sinclair 1000, Type-in program |
| Sound Generator for the ZX 81 | Three tone generator, one noise generator project. Reprinted from Electronics, Dec 1982 – Feb 1983 issue. | Timex/Sinclair 1000 |
| Sound Generator for the ZX81 | | Timex/Sinclair 1000 |
| Spectrum Hardware Restart | Photocopied from the March 1986 issue of Practical Electronics. | Timex/Sinclair 1000, Timex/Sinclair 2068 |
| Spectrum Motherboard | Create an expansion board for your computer. | Timex/Sinclair 1000, Timex/Sinclair 2068 |
| SQ-UP | In David Ornstein’s premier issue article (SQ Winter 82 p. 29) Using Extra Keys on Big Keyboard, add a symbol A atop the D1 lead toward the right-hand edge of the page. | Timex/Sinclair 1000 |
| Store BASIC on EPROM with an EPROM Programmer | Construction article for an EPROM programmer for the ZX81/TS 1000. | Timex/Sinclair 1000 |
| Super Data Save | Construction tips and parts list for a load filter and software package for the ZX81/TS1000. | Timex/Sinclair 1000 |
| Super Joystick | Use readily available hardware to create a full-function joystick compatible with the ZX81. | Timex/Sinclair 1000 |
| Surplus Keyboard Improvements for Extra Shifted Keys | The TI 99-4A keyboards, still widely available, are an ideal unit for the ZX81/TS1000 computers. Recent and not so recent articles have shown how the shifted keys on the KB-0 line cam be connected using two diodes. This method can give you four useful and often used shifted keys: EDIT, DELETE, quotation marks, and FUNCTION. | Sinclair ZX81, Timex/Sinclair 1000 |
| System Expansion Hardware | System Enclosures and Radio Frequency Interference; an add-on expansion bus. | Sinclair ZX81, Timex/Sinclair 1000 |
| T/S 1000 40K Non-Volatile Memory Expansion Project, Part II | | Timex/Sinclair 1000 |
| T/S 1000/ZX81 External Keyboard Buffer | | Timex/Sinclair 1000 |
| Tactile Feedback for a Dime | | Timex/Sinclair 1000 |
| Talk Can Be Cheap | Interface a ZX80/81 or TS1000 to a Texas Instruments Speak & Spell. | Timex/Sinclair 1000 |
| Tape Amplifier for Loading Weak Tapes | Circuit diagram for an op-amp based signal booster. | Timex/Sinclair 1000, Timex/Sinclair 2068 |
| Tape Amplifier for Loading Weak Tapes | | Timex/Sinclair 1000 |
| Tape Level Indicator | Bar-graph level indicator using LM3914. | Timex/Sinclair 1000 |
| Technical Tips for the Timex | Add a repeat key to the TS1000. | Timex/Sinclair 1000 |
| The "Truly Portable" Sinclair/Timex | Powering a T/S 1000 from Polaroid SX-70 batteries and a simple reset switch circuit. | Timex/Sinclair 1000 |
| The 192K ZX/TS Laptop Project | | Timex/Sinclair 1000 |
| The Amazing Digi-Dubber | | Timex/Sinclair 1000 |
| The Cassette Connection | With this issue, we start a “mini-series” on improving cassette reliability. I’m sure you’ll agree that unreliable LOADs are perhaps one of the most frustrating aspects of personal computing. With a little knowledge about the SAVE/LOAD process, we can take steps to save ourselves a lot of grief. We’ll start the series with a discussion | Timex/Sinclair 1000 |
| The Custom Cooler | It’s sad but true that the ZX81/TS1000 machines tend to be sensitive to overheating in the summer. With a solderless mod, you can in most cases cure the “summertime blues.” No, there’s no drilling and carving involved either. Most overheating problems can be attributed to the “workhorse” chip, or ULA (Uncommitted Logic Array) that co-ordinates | Timex/Sinclair 1000 |
| The Custom T/S | Let’s start our series on T/S reliability improvement with some simple but effective ways to make your basic machine virtually crashproof. If you’ve been using your machine for a while you’ve probably had times when the computer suddenly dies and nothing short of starting over will bring it back. I won’t belabor how annoying this | Timex/Sinclair 1000 |
| The G4IDE RTTY Terminal Unit | This terminal unit was, of course, designed to be used with my ZX81 RTTY program. However it is equally suitable for use with any micro-computer with a TTL compatible I/O port. | Timex/Sinclair 1000, Type-in program |
| The Great RAM Rescue | The Unused 1K-2K Space So, do those of you who have upgraded your ZX81/TS1000 to 16K ever feel sorry for that unused 1K-2K RAM, sitting unloved and unneeded inside your computer? Why not put it to work for you by wiring together this little circuit? It will convert your on-board RAM into a handy little | Sinclair ZX81, Timex/Sinclair 1000 |
| The Great RAM Rescue | Reprint of article from SYNC magazine. | Timex/Sinclair 1000 |
| The Joy of Joysticks: Add This to "Repeat-Key!" | | Timex/Sinclair 1000 |
| The Portable Timex | Reprinted from Computers & Electronics, August 1983. | Timex/Sinclair 1000 |
| The Re-chargeable BBU | Now we’ll make some changes and additions to “El Cheapo BBU” that will allow us to use rechargeable “NiCad” cells to provide back-up protection and short-term (up to an hour or so) portable use of your ZX81/TS1000 machine. This approach uses your good old T/S wall-plug supply to power the computer WHILE KEEPING THE BATTERIES | Timex/Sinclair 1000 |
| The Solid State Disk Drive (Part 2) | Four part construction article on building an EPROM/SRAM storage device for the TS 1000. | Timex/Sinclair 1000 |
| The Solid State Disk Drive (Part 3) | Four part construction article on building an EPROM/SRAM storage device for the TS 1000. | Timex/Sinclair 1000 |
| The Solid State Disk Drive (Part 4) | Four part construction article on building an EPROM/SRAM storage device for the TS 1000. | Timex/Sinclair 1000 |
| The ZX Breadboarder: A Proportional Joystick Interface | | Timex/Sinclair 1000, Type-in program |
| The ZX Breadboarder: The Digi-Dubber | | Timex/Sinclair 1000, Type-in program |
| The ZX-81/TS1000 Column | | Timex/Sinclair 1000 |
| The ZX/TS and 2716 450ns EPROMS | You may run into trouble using 450ns 2716 EPROMs on your ZX/TS. | Timex/Sinclair 1000 |
| The ZX/TS Serial Link | | Timex/Sinclair 1000 |
| The ZX/TS True 64K Internal NVM Upgrade | | Timex/Sinclair 1000 |
| The ZX81/TS1000 Column | Replacing the VHF modulator. | Timex/Sinclair 1000 |
| TI99 Keyboard | So, you got one of those TI99 keyboards from Radio Shack for $2.95 and still have not wired it up to your 1000 or 2068, right? I was going to write this up a while ago, but I learned that so many different companies made the circuit boards that it would be difficult to give | Timex/Sinclair 1000, Timex/Sinclair 2068 |
| Tim's Schematic: ZX81/TS1000 Out-Board Clock Module | | Timex/Sinclair 1000 |
| Timex Graphics | | Timex/Sinclair 1000 |
| TMS9918A Video Upgrade For The TS1000 | As can be expected with any major hardware upgrade, there are a few conflicts when the Oliger video system is used in conjunction with other equipment. Summarizes the fixes we and others have come up with to date. | Timex/Sinclair 1000 |
| TMS9918A Video Upgrade: Part 1 | The TMS9918A video project consists of two PC boards, a small modification/addition to the main computer board, and a +5, +12, -5 VDC power supply (an expansion board of some type is necessary). Video board “A” contains the TMS9918 VDP chip, 16K video ram and one support chip for I/O interfacing. Board “B” contains the | Timex/Sinclair 1000 |
| TMS9918A Video Upgrade: Part 2 | This second installment involves some explanation of the changes to the operating system and how they have been implemented. By actually placing the contents of the ROM on EPROM, you can change any routine, implement extra commands outside of the 8K ROM and have BASIC control of your new routines. It is only necessary to | Timex/Sinclair 1000 |
| Tone Generator | Generate tones on your ZX/TS by building this circuit and using a machine code routine with it connected. | Timex/Sinclair 1000, Type-in program |
| Truly Portable Computers | Letter to the editor from a Polaroid employee, suggesting the P100 Polapulse Powerpack as an alternative to SX-70 batteries for making a Timex/Sinclair portable. | Timex/Sinclair 1000 |
| TS 1000 Hardware Mod | Small, single capacitor mod to potentially improve video signal on TVs. | Timex/Sinclair 1000 |
| TS 1000 Keyboard Add-On | Wire a keyboard to your TS 1000. | Timex/Sinclair 1000 |
| TS 1000 Memory Expansion | Mod to support adding a 2nd 16K RAM pack to the TS 1000. | Timex/Sinclair 1000 |
| TS 1000 ROM Swap | | Timex/Sinclair 1000 |
| TS 1000 Signal Booster | | Timex/Sinclair 1000 |
| TS 1000 Stability Tips | | Timex/Sinclair 1000 |
| TS Help and Information: Modifications to Add-on Keyboard | Add one-key shift-lock, delete and function keys to a TI keyboard converted for the 1000. | Timex/Sinclair 1000 |
| TS-1000 Using 3 16K RAMPacks | | Timex/Sinclair 1000 |
| TS1000 Keyboard Addition | Here’s a nice beginner’s project for owners of ZX-81s, TS 1000’s and TS 1500’s. Although numerous keyboard expansion articles have been published, all require opening the computer to get at five signals that don’t go to the rear connector. This circuit uses a little extra hardware to produce five equivalent points, so the computer needn’t | Timex/Sinclair 1000 |
| TS1000 Monitor Project | | Timex/Sinclair 1000 |
| TS1000 Pulse Cleaner | | Timex/Sinclair 1000 |
| TS1000 RAM Pack Upgrades | | Timex/Sinclair 1000 |
| TS1000 Turbo | | Timex/Sinclair 1000 |
| TS1000 Turbo | | Timex/Sinclair 1000 |
| TS1000 Turbo | | Timex/Sinclair 1000 |
| TS1000 Turbo | Add a switch to add “turbo” mode to the TS1000. | Timex/Sinclair 1000 |
| TS1000 Video Driver | | Timex/Sinclair 1000 |
| TS1000 Video Driver Update | | Timex/Sinclair 1000 |
| TSMON | | Timex/Sinclair 1000 |
| Turbo Switch for the ZX81 | Transcribed from the Winter 1993 issue of ZXir QLive Alive. | Sinclair ZX81, Timex/Sinclair 1000 |
| Two Memories in One Space | Simple solution to multiplex the 8k-16k memory space. | Timex/Sinclair 1000 |
| Two Switch Human Interface for the Communicative Impaired | The program will usually display three rows of characters on the screen at any lime: the upper alphabet (UA) row, the lower alphabet (LA) row, and the message row. which will be empty at first. The program allows the user to select letters from the alphabet rows for display in the message row. | Sinclair ZX80, Sinclair ZX81, Timex/Sinclair 1000 |
| Un-interruptable Power Supply | Onward to replacing our good old wall-plug power supply with something more substantial. You have several ways to go, and I’ll try to touch on some of them here. BE CAREFUL as in this project we’ll be dealing with “raw electricity.” Not to scare you off, but “follow the rules” about insulating connections, observing polarities, | Timex/Sinclair 1000 |
| Understanding and Upgrading The TS1016 RAM Pack | This is the second part on upgrading your TS 1016 RAM pack to 64k. Last issue we discussed the ins and outs of dynamic memory and how the Sinclair RAM pack works. | Timex/Sinclair 1000 |
| Upgrading T/S Video | Correction to “Upgrading Timex-Sinclair Video” in the May 1983 issue to address a revision to the ZX81 circuit. | Timex/Sinclair 1000 |
| Upgrading Timex/Sinclair Video | Provides direct video and white-on-black screen characters. | Timex/Sinclair 1000 |
| Upgrading to a "Real" Keyboard: E-Z Key Makes It Easy | Back in the September ’85 issue of SUM, we ran an article on adding a large size keyboard to your computer. I find it necessary to bring it up again for this special issue. A fullsized keyboard makes all the difference in the world and E-Z Key has made it easy to build your own | Sinclair ZX81, Timex/Sinclair 1000, Timex/Sinclair 1500, Timex/Sinclair 2068 |
| User Defined Graphics for the TS-1000 | Your own custom graphics for less than $10? With just three IC chips, and a few extra parts, you can add a modification that allows you to change all 64 of the standard ZX/TS characters. To better understand the modification, we need to take a look at how the ZX/TS displays characters. To generate a | Timex/Sinclair 1000, Type-in program |
| User Defined Graphics for TS-1000, Part II | Here is the program for the TS-1000 which will generate and store your own characters into the custom graphics board as described in last month’s issue. | Timex/Sinclair 1000, Type-in program |
| Using Extra Keys on Big Keyboard - A Simpler Approach | Connections to map a single key to replace two keystrokes. | Timex/Sinclair 1000 |
| USR Key | | Timex/Sinclair 1000 |
| VDAQ - A Data Acquisition Development Program | Here is a program that demonstrates a simple yet effective way to get analog information (data) into your ZX81/TS1000/TS1500 computer, with a minimum of additional hardware. Also included are various plot and display routines so you can get visual and printed output of your acquired data. Along the way it will show you various “tricks” | Timex/Sinclair 1000, Type-in program |
| Vector Graphics | Hardware and software to drive a vector display. | Timex/Sinclair 1000 |
| Voice Reproduction | Machine language tools to sample and playback voice recordings. | Timex/Sinclair 1000 |
| Votem Cassette Controller | If you have a VOTEM, or if this article talks you into buying one, here is a simple modification which will extend the board’s utility further, and allow you to start LOADing a program from tape, flip a switch when the loading bars appear on the screen, and walk away; when the program has loaded, | Timex/Sinclair 1000 |
| Votrax Speech Synthesizer | Here is a ‘term paper’ written by one of my students who tackled the job of interfacing the Votrax SC-01A chip to his TS1000. He is presently working on a nice ‘menu driven’ program, similar to that described for the Parrot, which will give him a lot more versatility. | Timex/Sinclair 1000, Type-in program |
| WRX 16 Hi-Res for the 1000 | For several years, ZX81/TS1000 owners have dreamed of a simple bit-mapped high-resolution system for their machines. The quest began with the appearance of “software-only” high-resolution packages, which offered an improvement over the crude 44×64 block pixels, but left much to be desired regarding precision and ease of use. Several manufacturers came out with hardware add-ons | Timex/Sinclair 1000, Type-in program |
| Yet Another ZX-TS Fix | Do you have any of the following problems with your ZX81 or TS1000? | Timex/Sinclair 1000 |
| Your Timex/Sinclair Can Become a Terminal | Build a 8251 USART interface to connect a Sinclair to a modem. | Sinclair ZX81, Timex/Sinclair 1000, Type-in program |
| Z80 LCD | | Timex/Sinclair 1000 |
| ZEX for the ZX81 | | Timex/Sinclair 1000 |
| ZVOICE | Like many of you, I have been fascinated by the idea of speech synthesis. I even bought a GI SP0256 chip only to have it sit on a shelf, silently gathering dust. After all you need a robot or I/O board to make it work, right? Meantime others were having fun and contributing to the | Timex/Sinclair 1000, Type-in program |
| ZVoice | Reprint of ZVOICE. | Timex/Sinclair 1000, Timex/Sinclair 2068 |
| ZVOICE Part 2 | Listing 4 shows how a text to speech program can be implemented. A text string is scanned one word at a time, with “spaces” as separators. If the word is in the vocabulary, then the word is spoken; if not found, phonetic pronunciation of the word, or the phrase “WORD UNKNOWN” is spoken. New words | Timex/Sinclair 1000 |
| ZX Analogue-to-Digital Converter | Fast eight-bit analog to digital converter project. | Sinclair ZX Spectrum, Timex/Sinclair 1000 |
| ZX Burglar Alarm | | Timex/Sinclair 1000 |
| ZX Burglar Alarm | | Timex/Sinclair 1000 |
| ZX Resources | Parallel interface using the Z80 PIO chip. | Timex/Sinclair 1000 |
| ZX Resources: RS232 I/O | | Timex/Sinclair 1000 |
| ZX Resources: Transferring Between Computers | | Timex/Sinclair 1000, Timex/Sinclair 2068 |
| ZX-81 Computer Joystick | Describes how to connect a joystick, includes demonstration program. | Timex/Sinclair 1000 |
| ZX-EPROMer | | Timex/Sinclair 1000 |
| ZX/TS Repair Guide - Part II | This is the second in a series of articles on how to repair your ZX81 and TS1000. I will also try to cover some of the problems found in the 1500 and 2068 as well in future articles. From my experience with the 2X81 & TS1000, I would say that there are four common problems | Timex/Sinclair 1000 |
| ZX/TS ROM and RAM Addressing | ROM/RAM Immaterial As a result of my article “Your Timex-Sinclair Can Become a Remote Terminal” (Sync 2:6) a number of readers raised questions concerning the peculiarities resulting from attempting to use memory-mapped I/O devices mapped to addresses not affected by the use of a RAM pack. I have seen many references to the strange effects | Sinclair ZX81, Timex/Sinclair 1000 |
| ZX/TS True 64K Internal NVM Upgrade | | Timex/Sinclair 1000 |
| ZX81 & QL Regulator Bug | Suggested solutions to power regulation problems in the ZX81/TS1000 and QL: add capacitors. | Sinclair QL, Timex/Sinclair 1000 |
| ZX81 16K Byte RAM | The circuit on page 4 is for a 16K byte RAM extension board to plug onto the ZX81’s rear connector. Connecting the board disables the ZX81’s internal 1K RAM, but it is compatible with the Pseudo ROM and 24 line I/O circuits given earlier. 4116 dynamic RAM ICs have been used for low cost, but | Timex/Sinclair 1000 |
| ZX81 Baudot Interface | Here’s a nice article telling how to interface an ol’ Teletype machine to the Sinclair. Be sure to follow his tips on using an optocoupler, the voltages in a teletype would fry the Sinclair! | Timex/Sinclair 1000, Type-in program |
| ZX81 Data Acquisition Module | A/D converter for the TS/ZX using the TLC548. | Sinclair ZX81, Timex/Sinclair 1000 |
| ZX81 Data Acquisition Module | Part two of series on building a digital-to-analog converter. | Timex/Sinclair 1000, Type-in program |
| ZX81 Direct Video Output | | Timex/Sinclair 1000 |
| ZX81 EPROM Board | Schematic for interfacing an EPROM, static RAM or SEEQ’s 2K EEPROM to the ZX81/TS 1000. | Timex/Sinclair 1000 |
| ZX81 EPROM Board | Board layout, parts list and program listings. Continued from Sinc-Link v6 n1. | Timex/Sinclair 1000 |
| ZX81 Loading Filter/Interface | Op-amp based load filter schematic and construction details. | Timex/Sinclair 1000 |
| ZX81 RAMpack Expander | | Timex/Sinclair 1000 |
| ZX81 Resources | 1mb Bank-Switched Memory Board. | Sinclair ZX81, Timex/Sinclair 1000 |
| ZX81 Resources: 1mb Bank-Switched Memory Board | | Timex/Sinclair 1000 |
| ZX81 Resources: 64K SRAM Memory | | Sinclair ZX81, Timex/Sinclair 1000 |
| ZX81 Resources: A Tethered Robot | | Sinclair ZX81, Timex/Sinclair 1000 |
| ZX81 Resources: Analogue to Digital Converter | | Sinclair ZX81, Timex/Sinclair 1000 |
| ZX81 Resources: Joystick | | Timex/Sinclair 1000 |
| ZX81 Resources: Joysticks | | Sinclair ZX81, Timex/Sinclair 1000 |
| ZX81 ROM Adapter 2764 EPROM to Replace Sinclair ROM | Schematic to connect an EPROM in place of the ROM. | Timex/Sinclair 1000 |
| ZX81 RTTY Receive Program | Here’s a neat RTTY program receives that RTTY for you. The author interfaced his ZX-81 directly to his home made TU. (I’m assuming TTL signals). He connected his TU to pin 20 of IC1 in the ZX81. It is for a 16K machine. This short RTTY receive program overcomes some of the like timing problems | Timex/Sinclair 1000, Type-in program |
| ZX81 RTTY Transmit/Receive Program & Interface | Here is a nice RTTY transmit and receive program with the required hardware interface. | Timex/Sinclair 1000, Type-in program |
| ZX81 Tape Controller | | Timex/Sinclair 1000 |
| ZX81/TSXXXX Out-Board Real-Time Clock | | Timex/Sinclair 1000, Timex/Sinclair 2068 |
| ZX81/TSXXXX Out-Board Real-Time Clock | The following is a description of the Real-Time clock section of the D.A.M. board article which appeared in Time Designs Magazine ( March/Apr11 ‘ 87 page 23). The board features a full-function real-time clock with battery back-up and 1s mappable into eight I/0 port blocks. See attached schematic diagram. 8255 PPI The 8255 PPI is | Timex/Sinclair 1000 |
| ZXVoice | For starters, would you please dig out your October 1986 issue of ZX-Appeal and read Wilf Rigter’s article on pg 9 entitled “Z Voice” ? Thank you! Now I only have to talk about how to assemble the hardware. The schematic has been slightly expanded in detail over the one published in Oct ’86, but | Timex/Sinclair 1000, Timex/Sinclair 2068 |
