Richard Atkinson wrote: > > 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. This wasn't what I meant, I thought of the difference in the dot clock and Phi2 frequency: 8.18 vs 7.88 MHz and the same divided by 8 for Phi2. > 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 Then it might be worthwile to look for the 8MHz CP/M cartridge a German company made (or at least advertised) for a while. I think it was Rossmöller, the same company who made the first 65816 card with 4MHz (TurboProcess). But I have no idea who has one, might be interesting to see the schematics. For the Commodore Z80 cartridge: didn't Ruud draw the schematics? Maybe he knows what is wrong with the design. Nicolas - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail email@example.com.
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