[BBC-Micro] master keyboard
jules.richardson99 at gmail.com
Thu Oct 16 13:49:52 BST 2008
> Sorry, no.
> It's a matrix which is scanned by the system VIA and decoded by the
> OS. There is no decoding to ASCII or otherwise done on the board.
Yeah, I guess they changed as it was cheaper to do it that way; the earlier
System keyboard was ASCII. I had a heck of a job tracking one of those down
(or indeed any parallel ASCII keyboard as a substitute) when I needed one.
> I used to have (might still have) an old viewdata terminal keyboard
> that was RS232 ASCII based, but that's going back well over 20
That could work if fed through the appropriate gubbins. Although when looking
for parallel keyboards as above I considered doing this, but even finding a
serial ASCII setup was proving hard (I found a couple of such 1970s terminal
keyboards, but they were built like tanks and would have required a complete
rebuild to get rid of oxidisation problems)
I believe the RML 380Z keyboards were parallel ASCII - but they're rare as
hens teeth these days (380Z systems seem to be found keyboardless 90% of the
time). 'Sacrificing' one probably wouldn't be good classic computer karma.
My feeling would be that if you're building a Z80 system from scratch then you
probably know enough about what you're doing to rustle up something that can
take the stock BBC keyboard and spit ASCII out at the far side via a little
PIC micro or similar (or just use the VIA approach and do the scanning in
software as with the BBC) :-)
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