JK Audio Model JK-310 I/O Board with Real Time Clock
JK-310 is ideal for your applications and projects that require a real-time clock. JK-310 uses an OKI MSM5832 real-time clock chip.
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Timex/Sinclair 1000
Mod to Use Hunter RAM with > 32K
Hunter boards require a modification to work on systems with more than 32K RAM.
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49 Explosive Games for the ZX81
Review of the book by Tim Hartnell.
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E-Z Key 60 Keyboard
The keyboard is well designed, comfortable to use, is completely consistent with the style of ZX/TS computers and improves entry.
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Math
Use Math to introduce your children to the ZX/TS and give them experience with basic skills of addition, subtraction, multiplication and division.
Where to Move RAMTOP?
Many programs that put machine code routines above RAMTOP tell you to lower RAMTOP first. This program calculates just what decimal numbers to POKE to put RAMTOP where you want it.
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Pledge Keeper
Simplifies recording pledges and can be especially helpful during telethons or other fund raising events.
Computers for Kids — Sinclair ZX81 Edition
Review of the Creative Computing Press book.
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Direct Input Horizontal and Vertical Line Graphics
Lets you draw lines by direct input and loops so you can draw until you run out of memory.
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Real-Time Soft Clock
Creates a software clock from the 3.25 MHz ZX/TS logic clock using the system variable FRAMES at decimal addresses 16436 and 16437.
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Speech Pack
Speech Pack gives you computer-generated speech through your ZX/TS. Speech Pack is a black box with a special processor and ROM containing words. It has three other sockets so other word ROMs can plug in.