Synchronize

Plans for inexpensive expansion system.

Full-size, 62-key keyboard with instructions for converting to work with Sinclair computers. Keyboard manufactured by Texas Instruments.

Many vendors sold ZX80/ZX81/TS 1000 compatible edge connectors in solder-tail and wire-wrap versions. The wire-wrap connector could be used with a small printed circuit board to build a feed-through device that would allow for connecting another expansion unit.

Store programs in EPROM. Module holds four 2716 EPROMs for 8K of ROM in 8K-16K region.

Connects up to 4 Atari joysticks, full 8 direction movement.

Instructions on how to add a full-size keyboard to a ZX80 or 81. Includes instructions to use extra keys for shift lock, automatic shift, automatic repeat and reset.

Plans for building a modem.

Design and build your own supply to fit your needs. Includes how to estimate both present and future needs and covers both single and multiple-voltage.

Plans to build a RS-232 serial interface.