24 Jun
1998
24 Jun
'98
12:52 p.m.
On Jun 24, 23:38, Tony Duell wrote:
Yes, it is an 8021. The protocol is in "Inside Macintosh", Vol. III
pp30-32. It's fairly simple, though it's bi-directional.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
> > So, how easy is it to crock up a keyboard
and mouse for either
machine?
> > Can I modify IBM gear to fit the bill?
Not for the keyboard, it uses 8 data bits with no start/stop/parity bits
and a separate clock; XT keyboards use 8 data bits with 2 start bits, 1
make/break bit, and a stop bit; AT/PS2 keyboards use 1 start bit, 8 data
bits, 1 parity bit, 1 stop bit.
null modem
enclosure). The keyboard is Mac proprietary.
Yes, it's _strange_. 4 wires, +5V, Data, Clock, Ground. The mac end uses
the shift register in a 6522, the keyboard end uses a microcontroller
(8021?). Given a keyboard the protocol is probably hackable with a logic
analyser (future project?),