Sources for 8b TTL keyboards (Keytronics)

Jules Richardson jules.richardson99 at
Thu Dec 4 15:35:50 CST 2008

Tony Duell wrote:
>> 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 
> I cna think of one good reason why _I'd_ bother : 
> I prefer to think in terms of AND gates, flip-flops and shift registers 
> to assembly language. I find it easier to debug a board of logic than a 
> program. And I'd findit simpy more fun to sodler and wire-wrap than to type.

It's weird, that... I suspect I could rustle up something 'traditional' around 
a Z80/6502, ROM, RAM and some decoding - but my brain just doesn't cope well 
with single-chip 'black boxes' such as PIC-based widgets. I really don't know why!

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