On 19/12/12 22:47, email@example.com wrote: > Do I recall correctly that those carts were unreliable / unstable? Also, wikipedia states: [..] the cartridges only worked on early-model C64s from 1982 and were incompatible with later units [..] What do the authors mean there? > From Brian Bagnall's book: "Bil Herd wanted to make his C128 compatible with the existing Commodore CP/M cartridge, which used a Z80 processor. The cartridge was designed by an engineer they dubbed 'Shooting Star'. "This guy was supposed to design a Z80 cartridge for the Commodore 64," explains Herd. "One of the things I noticed when I did the C128 was that the Z80 cartridge didn't work in the C128, and it really didn't work in the Coomodore 64; they just thought it did." "Herd discovered the problem. "I'm going through this pile of papers a year later and I find a schematic for a Z80 cartridge," he recalls. "I open it up and look at it, and low and behold it's the Z80 coprocessor card for the Apple! Shooting Star ripped it off and that's why it didn't work." "Herd studied the problem and realized the CP/M cartridge used more power than the C64 supplied. "I got paid to be cheap and I couldn't afford to pay for half an amp that I would only use if somebody had the CP/M cartridge," he says. "I couldn't afford to add five dollars to the cost of [the C128]." Message was sent through the cbm-hackers mailing listReceived on 2012-12-19 13:00:04
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