Hallo Nicolas, > > If none, they cannot be used. A pro is that some people stated that they > > replaced their 1571 drive with a HD (?) one. > > Who did this? Do you have any details? None. I was not sure anymore if it they mentioned they used a HD one. The reason why _I_ assumed it was a HD is that you tell a FD to change one track by giving a pulse to a certain pin of the connector. So until recently I thought "1 track = 1 step". The 1541 can handle half-tracks ie. "1 track = 2 steps". So 40 1541-tracks make 80 steps. A HD-FD has 80 tracks = 80 steps. Knowing now that you used a former 360 KB drive means that for a 360 KB floppy "1 track = 2 steps". Hmmm, a weird idea just popped up. I only hope I'm not inventing the wheel twice. You stated you used a 360 KB FDD. Would it be possible to attach a HD FDD to your 1541 board in the same way? In this way one could use all 80 steps to save data on a floppy. Remark 1: I don't know if the HD FDD uses 1 or 2 steps/track. 2 s/t would be better as that means less SW to change. Remark 2: is there an adjustment of the current or whatever needed? A thought-avalange: - And what about skipping the analogue part of the 1541 and connecting the TTL-signals to the according shugartbus-pin? - And to hook the diskcontroller/6522 directly to the shugartbus? (Remark: requires SW change) I even dare to dream a little bit further: what about the same trick(s) but using a 3.5" DD- or even HD-drive? But that makes less sence as IMHO it may be is easier to build a 1581 yourself. I own a MicroPower 2000. Consider this roughly as a 4040-clone with an extra IEC-interface. The most interesting thing is it uses two SS shugartbus drives. We replaced these with normal 360 KB ones W/O any problem. Remark: only one side could be used. I intend to re-engineer it. This could give us the possibility to make a Catweasle-clone of our own ie. using 1541-floppys in a PC. Another idea is attaching a 3.5" DD-, maybe HD-, drive to this MP2000. But same remark as above. ___ / __|__ / / |_/ Groetjes, Ruud \ \__|_\ \___| http://Ruud.C64.org Message was sent through the cbm-hackers mailing list
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