Sources for 8b TTL keyboards (Keytronics)

[David Griffith]

On Fri, 5 Dec 2008, Jim Brain wrote:

> Roy J. Tellason wrote:
> >> Why bother?  AVRs and PICs are cheap and easy to work with (in
> >> particular, an AVR with SPI can be programmed with little more than a
> >> parallel port and a handful of resistors).   Code for handling AT-
> >> style keyboards abounds.  One DIP--that's all that it takes.
> >>
> >
> > Because I don't know a darn thing about any of that current stuff?
> >
> > This was only a couple or three logic parts,  from what I can remember,  not
> > all that much...
> >
> Not to weigh in on one side or the other, but I have prewritten routines
> in AVR C that will scan up to a 16x8 matrix and output PS/2 codes.  In
> the other direction, I have prewrriten routines to accept incoming PS/2
> data and output either RS232 or parallel ASCII codes, with support to
> trigger an IRQ on keypress.  My code runs on an ATMEGA8, which is a 28
> .300" DIP unit or a ATMEGA16/32, which is a 40 pin .600 DIP.

This made me start wondering about going a couple steps farther.  Consider
a replacement board for the controller found in a Model M keyboard which
is a drop-in replacement that turns the thing into a USB keyboard.

-- 
David Griffith
dgriffi at cs.csubak.edu

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