On Fri, 4 Sep 1998, Ruud Baltissen wrote: > Hallo Richard, > > Ruud: Your CP/M cartridge arrived today. Great job! Must return the favour > > somehow. Any old 8bit hardware you're looking for? (note: might be rare in > > the Netherlands, but common in England?) > > Still sorry for the real big delay but illness, tooooo much of work and > hollidays delayed the shipping. > My second computer was a ZX81. Through this one I got news of the existence of > the ZX80. If you can find that one for me, please. But only if it is not to > much trouble. Wow. You don't waste any time :-) ZX80s are incredibly, ridiculously, utterly, hopelessly, ludicrously rare. Needless to say, I have one (but it doesn't work). Anything else? > The CP/M disks on FUNET work fine with this module. But if you have to reset > for one or another reason, turn the C64 OFF!!! If you use a reset-button, it > seems that something stays resident and the system won't start again. Probably sets up a cartridge start routine. Anyone else know about this? > > Quick question: what's the maximum number of Commodore computers that can > > be on the IEC bus? I'm using the serial bus as a way of networking C64s > > but since each one has a pullup resistor on the serial bus bits, the line > > drivers (7406 open collector hex invertors) will only be able to support a > > few, much less than disk drives. Can I get away with 6 or 8 machines? > > Carefully cut the wire on the top of the resistor. If you need that specific > C64 as solo-machine again, a drop of solder will connect the ends again. Argh! Butchery of sacred Commodore machines! Well okay, so it's only a C64, but even so... I suppose I have to look up the specs on 7406. I always thought open collector devices could sink quite a lot of current, but just how much remains to be seen. Alright guys, down to business. Guess who found a 1551 disk drive yesterday? :-) That's right, in its original box with manual and diskettes. So far I have been unimpressed by its so-called "speed", but perhaps that's because I'm used to 1541 fastload routines such as Datel's Action Replay. So, the question is: how fast can the 1551 be driven? I had a brief look inside the drive (hmm, quite similar to the 1541C board) and the interface cartridge, and I can tell you that there are 16 (sixteen!) wires between the cartridge and the drive. So what are those mysterious coloured wires, and how can they help us? I figure it ought to be possible to get proper 8 bit parallel transfers, rather than the standard 3 bit (why?!?) protocol. Richard. - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail firstname.lastname@example.org.
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