Re: External KERNAL using a 6510

From: Jason Whitener (
Date: 2000-09-07 04:01:29

> On Fri, 1 Sep 2000, Nicolas Welte wrote:
> > I still wonder what they were trying to say about using that circuit on
> > the C128: is it not necessary to use the 6510 there, or is it not
> > (I think it would malfunction anyway if 2MHz mode is enabled).
> This brings an old idea to my mind: enable the C64 and Z80 modes on the
> C128 simultaneously.  According to the documentation, this is "forbidden",
> but my test (several years ago, maybe 1994 or 1995) showed that this
> combination probably enables both processors to run in parallel (with
> address and data lines ANDed together).  I wanted to write a program that
> runs on both processors.  This would require cycle exact timing, and I
> don't know the exact bus accesses of the Z80 in the C128.  Has anyone
> measured them e.g. with a logic analyzer?

I'm not sure how accurate this is, but several years ago, The Phantom of FOE
the US demo group designed a demo that was supposed to take advantage of the
z80 system for processing power.  I'm not sure which demo it was supposed to
have been or if it was just a load of bull, but that is what I remember.  I
might also have been mistaken, and it might have been using the c128 mode
for processing power, not the z80 side.  Not sure if this helps, but thought
I'd respond with what I knew.


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