There was a Z80 add-on chip that could be purchased for a C64 or a C128.
I think few people used it, tho... :-)
On Mon, 10 May 1999, Oliver Hillmann wrote:
> On Sun, 9 May 1999, Jonathan Hall wrote:
>
> > Yes, you're right... The Commodore 128 was NOT a Z80. It uses the
> > 6510/6502 family of processors, as did the Pet/CBM, Vic-20, Commodore 64,
> > Apple II, early Atari's and the Nintendo.
>
> This is rather getting a bit OT, but AFAIK the C128 had three
> modes:
>
> 1. The C128 mode which could use the whole 128 kByte RAM, provided some
> generic C128 operating system, and supported the enhanced command set
> which was a 65xx superset, as the main CPU was some 65xx compatible
> thingy... Remember the built in machine code monitor... :)
>
> 2. Then there was the C64 compatibility mode, which made you encounter a
> generic C64....
>
> 3. And then there was CP/M for the C128, and AFAIR it was hardwardly
> supplied by a Z80 which was built into the C128 - a second processor! I
> may be wrong in remembering this extra chip being built in generally, that
> Z80 might also have been provided by some upgrade cartridge or so...
> But that would not have been a too far improvement from the C64, as you
> also could get a Z80-CP/M cartridge for the C64....
>
> So I would rather bed on the C128 having two CPUs: a 65xx compatible
> one (AFAIK its was named something like V4???? I might be completely
> wrong with tha part...), and a Z80... :)
>
> Greetings,
>
> Oli
> --
> Oliver Hillmann, Berlin (Germany) <[EMAIL PROTECTED]>
>
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Jonathan Hall * [EMAIL PROTECTED] * PGP public key available
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