> > > So, now I happen to own a KIM which I belive is the real #1
> > > board. The CPU is a MOS MCS 6502 dated 4675, white ceramic.
> Hans, you big show-off ;-)
:) Well, I had to shrink warp it, since I'm still unable to
stop drooling over the board.
> > > As such it is from the very first batch of 6502s, of course
> > > includeing the infamous ROR bug (no, Intel wasn't the first
> > > to sell buggy CPUs :). It ends not just there, but it might
> > > even bee THE first 6502 - or at least the first to be used
> > > in a manufactured computer.
> > That's a pretty nice little item. I'm curious about this ROR bug - I don't
> > remember talk of it from the time. Do you know when it was fixed? I happen
> > to have an OSI 300 (a very primitive 6502 trainer) with a similar CPU
> > datecoded 4775 on it, I would guess it's buggy too.
>
> According to the Commodore 64 Programmer's Reference Guide (remembering
> Commodore bought MOS), which has the full original 6502 instruction set
> description in it: "ROR instruction is available on MCS650X microprocessors
> after June, 1976."
Which also prety nicely displays Commodores (or better
Tramiels) way of recycleing of handbooks. They rearely
did new stuff when they could make up something from
existing which looked like the needed documentation.
Gruss
H.
--
VCF Europa 4.0 am 03./04. Mai 2003 in Muenchen
http://www.vcfe.org/
Received on Tue Nov 19 2002 - 08:22:01 GMT