Re: External KERNAL using a 6510

From: Marko Mäkelä (
Date: 2000-09-01 13:37:51

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 _possible_?
> (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?


This message was sent through the cbm-hackers mailing list.
To unsubscribe: echo unsubscribe | mail

Archive generated by hypermail 2.1.1.