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davidgiven / fluxengine

PSOC5 floppy disk imaging interface
MIT License
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Rare unknow 8" format #694

Open xolod79 opened 1 year ago

xolod79 commented 1 year ago

I made a dump of a very old 8" floppy. Presumably this is from the Multi-20, an analogue of the Microdata-1600 https://mega.nz/file/6sgk1RpT#z6X3cYIrqrPC53aS60Zq_4Z40yr7x1G0LQpVdNxhxig is it possible to make this format?

davidgiven commented 1 year ago

I had a very quick look --- it's single-sided soft sectored. I only see two pulse intervals at 2µs and 4µs, which normally suggests FM, but no visible data appears when using an FM decoder. Unfortunately the read is very bad and everything above about track 10 is corrupt (the frequency histogram is horribly smeared). I think the disk may have degraded with age, or being stored near a magnet. Do you have any pointers to technical information?

On Sat, 8 Jul 2023 at 15:25, xolod79 @.***> wrote:

I made a dump of a very old 8" floppy. Presumably this is from the Multi-20, an analogue of the Microdata-1600 https://mega.nz/file/6sgk1RpT#z6X3cYIrqrPC53aS60Zq_4Z40yr7x1G0LQpVdNxhxig is it possible to make this format?

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xolod79 commented 1 year ago

Unfortunately there is no additional information.