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  • I should have noted that I also need .D64 images, if that makes any difference to your answer. (I've updated the post.) The rest I don't quite understand: there are no actual floppy drives involved here: I'm producing an image file that's given to a device that emulates a CBM drive for a real C128. And your post doesn't give the details of what program and parameters I use to produce the correct format. Commented Nov 11, 2024 at 2:24
  • You wrote “I have now is a friend who's got a Commodore 128” and for CP/M mode that means they need the 1571 too (or a C128D with a built-in 1571 drive). Otherwise it's not going to work. The C128 CP/M mode uses special commands in the drive that utilize the WD1770 controller. The GCR controller is not used in CP/M mode. Commented Nov 11, 2024 at 9:49
  • So you need to produce MFM disks for the real thing. Standard 360KB double sided 40-track nine 512 byte sector disks. Same as for MS-DOS. With a PC disk drive. — If you want to do the same in an emulator that doesn't support plain MFM disk images but only D71 images, you have to produce special D71 disk images just for that particular emulator that this emulator unfolds as MFM disk images internally. Commented Nov 11, 2024 at 9:52
  • Ah, I got it. You want to use the Ultimate II instead of a 1571. I'm afraid this isn't going to work as it does not emulate the WD1770 MFM controller as far as I am informed. Commented Nov 11, 2024 at 9:57
  • I checked, and the Ultimate II+ with the latest firmware supports all the U0 burst commands so it should work. You have to check its documentation to find out how it expects the D71 images to be packed so that they unfold as MFM images internally. Commented Nov 11, 2024 at 10:10