Re: Demokorppu

From: Marko Mäkelä (
Date: 1998-03-24 22:01:57

On Tue, 24 Mar 1998, Howard Herman wrote:

> As far as I know the C64 is the only computer to have its CP/M system on
> ROM (in a plug-in cartridge), and everyone seems to agree that this
> rendition was an utter failure.

Nope, the C64's CP/M cartridge doesn't have any ROM, just the Z80 and a
few chips that will perform address translation so that C64 addresses will
be Z80 addresses + $1000.  The Z80 boots from $0000, and it was much
easier to load the Z80 code to $1000 than to $0000 (because of the 6510's
two I/O registers at 0 and 1).  The CP/M cartridge requires a boot disk. 
BTW, the C64 CP/M uses a different high-level format for the 1541 disk
(constant amount of sectors per track, wasting lots of sectors).

> Up until recently (and maybe even now) some fellow (cannot recall his name)
> on the newsgroup, comp.os.cpm, was the keeper of CP/M system boot disks. 
> He would be the first person to contact for a boot disk, if you need one.

The C64 and C128 CP/M boot disks are in, together with many Commodore
test/demo disks. 


Archive generated by hypermail 2.1.1.