14 Jul
2014
14 Jul
'14
2:24 p.m.
On 07/14/2014 01:41 PM, Hayden Kroepfl wrote:
The keyboard I'm using now is a 1988 1391401 Model
M with a modular
jack. As best I can tell there's no switch or other external mechanism
on it for changing to an XT compatible mode.
No matter, if it doesn't. Go look over on vintage-computer.com forum
for a very inexpensive AT/PS/2 converter to XT using an 8 pin PIC MCU.
It's so simple that it can be constructed on a small piece of perf
board, but PCBs may still yet be available.
A lot of keyboards could auto-switch between the two protocols. It
usually starts with the keyboard sending a bunch of PS/2 NAKs. If the
host doesn't respond, XT mode is assumed.
The keyboard that I used for many years was a made-in-Germany NCR
Cherry-switch model. 30 function keys, but no F11 or F12. Otherwise,
very nice.
Currently on a Model M.
--Chuck