> On 2020-03-25, at 15:52, Jim Brain <brain_at_jbrain.com> wrote: > >> "It was also possible, without requiring a VIC-switch, to connect two Commodore 64s to one 1541 floppy disk drive to simulate an elementary network, allowing the two computers to share data on a single disk (if the two computers made simultaneous requests, the 1541 handled one while returning an error to the other, which surprised many people who expected the 1541's less-than-stellar drive controller to crash or hang). This functionality also worked with a mixed combination of PET, VIC-20, and other selected Commodore 8-bit computers." >> >> Has anyone tested that? Is that a fully deterministic/reliable behaviour? >> >> > I can't even see how it would work. The 64 doesn't check for activity on the bus before driving it, so that would corrupt transfers in progress. My guess is that as long as ATN line is not used for data transfer (like in some ill-coded speeders that require disconnecting everything else off the bus in order to work) that might be enough to "signal" "I am not here for you" to the other computer. -- SD!Received on 2020-05-30 01:21:04
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