GitHub – bbbradsmith/flompy: DOS floppy disk dumper
Posted by jpluimers on 2022/04/26
Need one day when archiving old floppies: [WayBack] GitHub – bbbradsmith/flompy: DOS floppy disk dumper
Via: [WayBack] Brad Smith on Twitter: “So I wrote a floppy disk dumper program for DOS. I dunno if this is really a very useful thing, but it’s open-source at least! š¾ā”š„ “
Full thread atĀ [WayBack] Thread by @bbbradsmith: “Hrm… why doesn’t the floppy controller status register have its non-DMA bit set, even though I’ve used a specify command to set it… and [ā¦]”:
Hrm… why doesn’t the floppy controller status register have its non-DMA bit set, even though I’ve used a specify command to set it… and why (probably related) do I get only a single IRQ from the read track command…? š¾ā”š„Life is a mystery.
Alright I have coaxed 74 bytes of data out of the floppy controller. That’s a start I guess.I think I just need better information about the parameters to the ĀµPD765’s “read track” command. The datasheet I have sucks, and otherwise all the info I can find is from people who seem to have never tried to use it. š š¾I think my DOS floppy dumper almost works, except the IRQ written in C is too slow? Unfortunately Watcom’s assembler is hideously underdocumented, and I can find no relevant examples, especially not for Real Mode programs. :(Finally got the assembly version of the IRQ handler working, and actually got some fairly consistent data out of the read track command……but I don’t think it’s really the data I wanted. I’m going to shelf this project and see if I can build a fluxengine instead. :S
LOL I just wanted to buy the cheapest ATX socket on ebay to to make a little power jumper connector, and the cheapest one already has the wire stuck onto it.“…for BTC” š¤£
So I wrote a floppy disk dumper program for DOS. I dunno if this is really a very useful thing, but it’s open-source at least!
š¾ā”š„
–jeroen
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