Strap Down
Prevent RAM pack wobble and system crash. Kit contains high strength, precut and punched strap to hold down the computer and RAM pack, cable clamp to organize cables. Computer can be fastened to portable board or desk top.
Timex/Sinclair 1000
TTL Serial Input/Output Port Package
Software and plans for building input and output ports which fit inside a ZX81 or TS1000. When used with an RS232/TTL level converter, can connect to most RS232C peripherals.
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8K EPROM Board
Allows up to 8K of EPROM or RAM in 2K blocks to be added in the 8-16K ZX81 memory map. Supplied with EPROM I which contains 40 toolkit type routines, including scroll up/down/left/right, free memory, renumber program length.
DCP P/A/C Packs
A set of packs giving ZX81 memory, control and analog interfaces. The P-Pack plugs gives 4K of CMOS RAM plus I/O Port. The analog pack or control pack onto the rear of the P-Pack.
DROM
DROM stands for Development Read Only Memory. This module can have up to 8K of RAM, via plug-on 2K RAM chips. The memory is backed by rechargeable battery for non-volatile storage of programs and data. Behaves as normal read/write RAM when the computer is in use. Individual 2K blocks can be protected against overwriting. DROM
Graphics Generator
Peripheral enabling alternate character sets to be used and printed either from EPROM or user-defined character sets in RAM. 4K of EPROM is supplied containing 4 character sets and routines to print, copy, lprint and switch between character sets. A further 2 x 2K of RAM or EPROM can be added.
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I/O Board
32 line I/O board. Ports mapped to 4 absolute locations. Port A has 8 LED indicators. Port B has 8 outputs. Splits into 2 ways each so one instruction can be used to switch between two peripherals. Port C is uncommitted. A status indicator gives a 16 LED indicator of the state of Port B.
Joystick Adaptor
Connect Atari compatible joystick to the ZX81/TS 1000. Plugs into back of computer; expansion connector for other peripherals. Instructions for patching popular games. Uses port 1Dh.
Minimap
Memory mapping device to expand address space from 64K bytes to 1 megabyte. Organized into vertical 64K pages. Up to 16 pages can be supported. All memory can be dynamically defined from within a program, allowing (for example) a program in one segment to manipulate the contents of various data segments. A module in the