Marko Mäkelä wrote: > > Christopher Phillips wrote: > > Should be any that support M-W and M-E, has a page I can use > > for code at 0x500, ... > > A wild idea: How much does the hardware of the PET disk drives vary? > Would a custom routine that runs on the DOS CPU work on all types of > drives (040, 850 and 900)? Of course, the protocol would Simply speaking, the hardware doesn't differ at all between those drives. The differences are very minor and are on the controller CPU's side (6502 vs 6504, though the memory map stays the same), the 8x50s/1001 run a faster GCR clock speed, and the harddisks have a SASI bus hooked up on the controller side. I think the 8x50 boards even have a jumper that allows them to run in the slower 4040 mode. The differences in software might be bigger, the mapping of memory locations has probably changed during evolution from DOS 1.0 to DOS 3.0. Nicolas Message was sent through the cbm-hackers mailing list
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