Three Crazy Ideas
While I’m optimistic that the floppy write emulation technique described yesterday will work (at least for high speed cards), it would be great if I could buy an extra safety margin of time, or find a way of throttling the…
Category Floppy Emu
A floppy disk drive emulator for Macintosh computers, using an SD memory card and custom hardware to replace a 3.5″ disk drive and floppy disk.
Floppy Write Emulation, Continued
My apologies for another post full of abstract floppy emulation thoughts, with nothing concrete to discuss and no photos to show. As readers have no doubt noticed, I’m having a difficult time wrapping my head around the best way to approach this problem.…
Floppy vs SD Card Write Speeds
Which would you guess supports faster write speeds: a modern high-speed class 10 SDHC Flash memory card, or a vintage 1984 floppy disk employing a mechanical stepper motor to move its drive head, spinning magnetic media at a lazy 400…
SD Write Speed Anomolies
I have floppy disk write emulation almost working for Floppy Emu, using an almost painfully simple technique. When the Mac sends data to be written, an interrupt routine decodes it and stores it in a RAM buffer. Once a full…
Violating Setup Times With Floppy Writes
I’m working on adding write support for the Floppy Emu emulated Macintosh floppy drive. Data coming from the Macintosh to be written to the floppy is encoded in an interesting way. There’s no clock signal, but just a single WR data…
Implementing Floppy Emu Writes
I’ve yet to implement write support for my SD card Macintosh floppy emulator, but my rough plan was: Perform GCR decoding on the fly, and store decoded sectors in RAM When the Macintosh steps to the next floppy track, use…
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