28 Apr
2007
28 Apr
'07
4:18 a.m.
Hi,
My experience is that all the second processors -- no,
make that
all the 'cheese wedgrs' -- are rear.
It's a shame I never got one when I picked up my other "wedges". It was
always on my "list" of things to get, but they used to be reasonably easy to
find at radio rallies and I always ended up finding something more
interesting and leaving it for "next time".... :-(
I think you've forgotten the 'TUbe ULA'
That's a 40 pin custom chip
that handles the communication between the Beeb and the second....
I certainly had. Bit of a show stopper that really.... ;-)
<grin> I was just trying to remember where I'd stored that wirewrapping
stuff I haven't touched for 15 years too.</grin>
The Torch Z80 board did, indeed, use only sandard
chips.
Changing the subject slightly, IIRC the original "Acorn 6502 Second
Processor" cheese-wedge was just that, a faster 6502?
Did Acorn ever release a "cheese-wedge" 65c02 or 65816? Also, is it possible
to replace the 6502 in one of these with a 65c02; not that I'd actually try
it, unless the 6502 was socketed, but I recall having BIG problems (in fact,
total failure IIRC?) when I tried running a 65c02 in a Model B sometime in
the early 90's?
TTFN - Pete.