Re: 6808 <-> 6800 (off topic)

After digging around for the last half hour and looking at the mame source, Im thinking
that the 6808 and 6802 have the same instruction set as the plain jane 6800. The main
difference on the 6808 must just be the internal clock generator (crystal not included)
since the 6808 doesn't have internal RAM like the 6802.

Franklin Bowen wrote:
>
> Oh, now I get the question. I never did find datasheets online for them when I
> was looking last year. I did get some through a faxback service but don't
> remember the company.
>
> So I do have a faxed version of the datasheet but somebody on this list has to
> have something better, right?
>
> Jess Askey <jess@magenta.com> on 07/15/99 04:08:52 PM
>
> Please respond to vectorlist@lists.cc.utexas.edu
>
> To: vectorlist@lists.cc.utexas.edu
> cc: (bcc: Franklin Bowen/MD/CheckFree)
>
> Subject: Re: 6808 <-> 6800 (off topic)
>
> But, there do not seem to exist datasheets for either the 6808 OR 6802. Only the
> 6800 and
> 6809. :-(
>
> Franklin Bowen wrote:
> >
> > The 6808 is a ramless 6802 so the instruction set should be identical. I'm
> not
> > sure how they relate to the 6800 and 6809.
> >
> > Jess Askey <jess@magenta.com> on 07/15/99 03:55:45 PM
> >
> > Please respond to vectorlist@lists.cc.utexas.edu
> >
> > To: vectorlist@lists.cc.utexas.edu
> > cc: (bcc: Franklin Bowen/MD/CheckFree)
> >
> > Subject: 6808 <-> 6800 (off topic)
> >
> > Does anyone here know if the 6808 had additional instructions over the 6800. I
> > know that
> > the 6809 covers both of them but I can't find any datasheets for the 6808/02.
> Im
> > afraid to
> > use the CPU reference cards by Jon Bowen since they tend to miss some
> > instructions. I
> > heard rumors of a bug in the MAME 6808 driver and Im having problems verifying
> > all the
> > opcodes.
> > thanks, jess
Received on Thu Jul 15 15:24:22 1999