That was my experience, yes. There were some other issues then that related to VIC chip timings but they were relatively minor. I know on at least one occasion where production reworked the 257's under the assumption that they were doing it for speed, the net was that they got more working CPM carts. I found the schematic of the Apple's Z80 cart that the guy copied a while back, I will scan it and put it up if I find it again. -----Original Message----- From: firstname.lastname@example.org [mailto:email@example.com] On Behalf Of Anders Carlsson Sent: Thursday, December 20, 2012 2:30 AM To: firstname.lastname@example.org Subject: Re: CBM's CP/M, Z-80 carts for the 64 Bil Herd wrote: > So while it was known that [some] 257's didn't work well Am I understanding this correct that whether a C64 (or C128, or other C64 related computer) will operate with the CP/M Z80 cartridge to a big part is due to which vendor(s) of the 257's and perhaps other 74 series chips are installed in the computer? If so, those who have the cartridge and a selection of machines could try to verify if it generally holds true. In the rare case those chips are socketed, perhaps they could be substituted for another brand if a dog slow, 40 column CP/M or other Z80 application is desired to run on a C64 in the 21th century. Best regards Anders Carlsson Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing listReceived on 2012-12-24 06:00:08
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