I figured out that emulating the ‘320 properly has to be so low level that the whole emulator is slowed down unacceptably, so I’m working on an HLE version based on the hardware instead. I can’t seem to figure out the new floppy subsystem though. What device should I look at for a good example of reading an MFM image? I’ve been copying from one of the other Motorola controller drivers but can’t work out how the PLL stuff works.