[BBC-Micro] BBC Master SCSI
jules.richardson99 at gmail.com
Tue Jun 2 13:25:32 BST 2009
Darren Grant wrote:
> I realised this morning that I'm way out of date in electronics these days.
> I had a go with building a CPLD design but found myself way out of my depth.
> There was a time when I would have enjoyed figuring it out but now I realise
> I don't have the patience or inclination anymore.
Hmm, aren't there sufficiently few LS IC's to the Master SCSI I/F that if you
just want one in a hurry, glue the darn chips upside-down to any old scrap bit
of sheet* and run wires between the legs? :-) It'd be about as inelegant as
it's possible to get, but at least you'd have a SCSI I/F in about 30 mins, and
could buy/build a more robust and professional version when one was available.
* although there's nothing wrong with doing that on a proper bit of
stripboard, either, would would at least be reasonably strong.
The original Master interface ignores /ATN, /DBP etc. and it'd be nice if any
modern solution at least provided these at the hardware level (with the hope
that someone could throw together suitable software further down the line) -
so any professional board perhaps isn't as simple as taking the existing
schematic and reproducing it.
p.s. I might actually have some Domesday time later this week!!
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