Sources for 8b TTL keyboards (Keytronics)
cclist at sydex.com
Thu Dec 4 13:59:21 CST 2008
On 4 Dec 2008 at 14:14, Roy J. Tellason wrote:
> I've had idle thoughts from time to time about building one of those and
> sticking an EPROM between the outputs of that circuit and the device to be
> driven, to convert the scan codes that you get to ASCII or whatever. Maybe
> one of these days I'll get that particular round tuit. :-)
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.
I can see the motivation to do something "the vintage way", but even
the 5170 uses a uC to interface to the keyboard. If you wanted to go
"vintage', an 8048 or 8051-family uC would do the trick.
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