Sources for 8b TTL keyboards (Keytronics)

[Chuck Guzis]

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.

Cheers,
Chuck