30 May
2007
30 May
'07
7:29 p.m.
Hi,
Ah, thanks for that....it's been a few years since I had the lid off mine.
I never did figure it out, it *should* have just worked....but didn't, the
machine wouldn't come out of reset.
It was a known good processor too, worked perfectly in the machine I
salvaged it from (a prototype system I had in my desk draw at work (we used
65c02s as second processors in our terminals to read barcodes, mag cards,
etc)) and also in an Atari 400. Wierd.
Changing the
subject slightly, IIRC the original "Acorn 6502
Second Processor" cheese-wedge was just that, a faster 6502?
Actualy, it's a 3MHz 65C02. ....problems
(in fact, total failure IIRC?) when I tried running
a 65c02 in a Model B sometime in the early 90's?
I can't think why -- it's a drop-in replacement and lots of people
have done it.... ....Sometimes you need to change the 74LS245 data bus
buffer that's
near the 6502 to get best results, but usually only if a Second
Processor unit is involved.
Hmmm....I'm not 100% certain, I had two Beebs then, but I don't think that
particular machine had a 2nd processor attached (my other Beeb had the Torch
Z80 2nd Processor and "Disk Pack").
I *DO* remember also being unable to get a Solidisk sideways RAM/ROM board
(and clock speed accellerator?) to work in that machine. In fact, the reason
I tried installing the 65c02 in it was bevause the Solidisk board was
supposed to support the use of a 65c02 at a faster clock speed - the board
plugged into the processor socket and the processor into the board.
Maybe it was an early revision main board in the Beeb?
TTFN - Pete.