Sinclair z80 Co-processor page
The Sinclair has 8k ROM of BASIC and basic I/O routines, 2K RAM
(expandable using hacks published on the internet), a Z80 processor
It has a keyboard connector (screw the keyboard that is installed!),
VIDEO OUT, will run with a few batteries, has TAPE IN and TAPE OUT
connectors, and a connector that gives you access to ALOT of the
CPU pins (address lines, data lines, etc).
You can run this computer from 4 C batteries. It was free,
it runs on very little power, is easy to hook stuff up to
the I/O connector, and easy to program. Small too.
I moved all the hardware drivers out of the apple. All the drivers do is
waste time and the Apple needs to pay attention to where it at on the
I send the Sinclair simple commands like "Forward 20" and it will move
the correct motors the correct distance.
It will also generate interrupts for the multitasker he's using.