Started by Gryzor, 07:10, 10 December 22
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Quote from: merman on 13:04, 10 December 22A quick bit of history...Commodore advertised a CP/M cartridge for the C64, which would have contained a Z80 processor. It was heavily delayed in development, and the company was fined for advertising a product that was not readily available.It was eventually released, but had compatibility problems with some models of C64 and the newest (at the time) CP/M programs.As development on the Commodore 128 started, the marketing department started promising "complete" compatibility with the existing C64 software and hardware. One of the biggest issues was the cartridge port. So the idea was taken to include the Z80, add CP/M compatibility to the new 1571 disk drive and add a workaround to the cartridge port to get things like the CP/M cartridge working.The C128 ended up about 85-90% compatible with C64 software, and a high rate of compatibility with CP/M - at the cost of speed.
Quote from: Gryzor on 07:10, 10 December 22https://retrocomputing.stackexchange.com/questions/2361/why-does-the-commodore-c128-perform-poorly-when-running-cp-m
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