Ahh, maybe I'm thinking V-series then. There did seem to be some Transputer-y stuff in the bootrom.
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1/ We don't, though. We know that it's MFM written with an 8MHz bit clock, 500kHz servo clock. We know that a track begins with MFM zeroes followed by either 0x91 0x25 in MFM or 0x53 after de-MFMing.
2/ We also know that a track ends with that same value after de-MFMing. We also live in a day and age with cheap 32-bit microcontrollers that have USB interfaces, and can run C code, and with performance that blows a Disk Sequencer Card with an Am2910 out of the water.
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Realistically what it needs is someone with both the necessary drive to sling the cartridge into, and both the hardware and software smarts to whip up a microcontroller-based solution to just step from cylinder to cylinder and head to head, dumping out the bistream.
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4/ I'm happy to advise on the timings, sequence of commands, and so on, but I have all the soldering skills of a pensioner with Parkinson's and the hardware acumen of a bricklayer.
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