Hello, >> So it's possible the pcb from the MiniScribe disk isn't okay. You >> have checked the stepping logic. At this time you miss the pulses at >> the INDEX line. Is this signal present with the working disk? If you >> see the pulses, you can analyse where the signal are generated. This >> signal must be pulse once at one rotation! > > No. I have scoped the ST-4096 I am currently using, and it also does > not seem to send the INDEX signal. Which level can you meassure? If it's low, because there is a missing pullup on the controller? Many signal are only open collector. The input side muß pull up the signal! > So apparently it's not the problem for the controller. That's the question. It's possible we have more then one error ... >> The MiniScribe 3650 and 3675 >> (http://bitsavers.informatik.uni-stuttgart.de/pdf/miniscribe/Miniscribe_5.25_Inch_Half_Height_Tech_Support_Manual_Sep88.pdf) >> has an error code 4 for the case "Index pulse not detected during >> spinup". And the code 4 means: > > Yes. I have seen this error being flashed when the drive fails to spin > on powerup, which it does quite often. Combined with a screeching > sound it generates on some occasions when spinning, Okay, so the drive is successfully started. But you have trouble to read. Have you scoped the data line? > I think this disk just needs to be written off :-) Or newly formatted ... 8-( Martin Message was sent through the cbm-hackers mailing listReceived on 2014-10-24 02:00:03
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