Posted By
MMS
on 2021-05-02
19:53:20
 |  Re: World of Commodore 2014 pictures, video, reports
I've just run into a project that after replicating the original CP/M Cartridge, now works with 8MHz Z80 CPU, and (more) compatible with the newer C64 models.
According to the schematics, uses the same DMA line as the original one.
And still the original discussion point is, that there is no such line on Plus/4 expansion bus as DMA (NMI not required here), and the 8501 CPU's RDY signal also not available on the expansion port.
The new version:
https://www.pcbway.com/project/shareproject/8MHz_Z80_Card_for_Commodore_C64.html
The original CP/M replica project:
https://www.pcbway.com/project/shareproject/Commodore_CP_M_Cartridge.html
The schematics of the new:
https://github.com/DL2DW/Z80-Card_for_Commodore_C64/blob/main/Schematic/Z80%20Card%20for%20Commodore%20C64%20V0.3.PDF
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