On Mon, 20 Mar 2000, Nicolas Welte wrote: > I always wondered if there are different versions of the CP/M cartridge > for PAL and NTSC systems. After all the timing between these two differs > much more than between any revision with the same video system. 'Timing' here refers to the nature of the signal waveforms on each individual clock pulse; not the number of clock pulses per line / frame / whatever. I think it's about time cbm-hackers looked into what can be done to the CP/M cartridge to make it compatible with all C64s. I see it not as a CP/M cartridge but a general purpose Z80 second processor, and I'd like to be able to run ported ZX Spectrum code on a C64 with CP/M cartridge or a C128. An example of this might be the music routine from a 128K Spectrum game; having extracted the routine and trapped all the OUT instructions that wrote to the Spectrum sound chip, it could run on a Commodore machine and output a list of the sound chip registers and their updated contents. Then a generic 6502-based conversion utility could translate all the Spectrum sound chip register values into equivalent SID writes. I think if we work from the assumption that it is the CP/M cartridge that is at fault and needs changing, then there could eventually be a quick hack for the relatively small number of them out there, to allow them to run on all C64s (including C64Cs). I wonder if Bil Herd recalls the nature of the problem with the CP/M cartridge. Richard - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail firstname.lastname@example.org.
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