Hi,
Acorn used a custom "ULA" chip to handle
communications between
the second processor....
Damn! That puts a crimp in an otherwise damn fine plan. ;-/
I honestly don't remember seeing the ULA when I last had my 6502 2nd proc
apart, but it's been the best part of 10 years....
The Acorn one has definiatly been emulated, in
Sprow's AEM7TDMI
co-processor for example: <http://www.sprow.co.uk/bbc/armcopro.htm>
Sounds like an interesting page, I'll go check it out. Thanks.
Do you know of
any websites where I could get more info?
Sprow's page above has a link to Acorn's Tube application notes - that
should get you started on how the tube actually /worked/ ..
Thanks.
I did try googling for the information before asking in here. Unfortunately,
at the time, for some reason I couldn't find much beyond "'cheese wedge'
second processors work" and "there were internal coprocessors for the
Master".
Things are a lot clearer now.
Whilst not wishing to remove an 8-bit thread from cc,
you are
probably best asking for technical info over on the bbc micro
mailing list....
Thanks, I found that one shortly after posting my previous message. I've not
subscribed yet, just been browsing the archives for now. Looks good.
TTFN - Pete.