Free: Stack of Victor or Sirius floppy disks

Actually, I don't _know_ that's all the case but I am prepared to state it. The Mac+ liogic board certainly outputs a PWM signal and from what I can remember of 'Inside Macintosh' the area of memory it is laoded from is descrivd as being for disk motor control. The 400K drive that Terry is working on, which must be clearly similar to the Mac 400K drive, if not identical, and that one certainly takes in a PWM motor control signal (the adapter board, I forget the name, that's used in the Lisa with this drive is essentailly a PWM generator). The 800K drive most certainly does not make use of this PWM signal, but it is variable speed, so I guess it must be settign the speed form the cylinder number. One thing to watch for when working on older Max is that the floppy drive ribbon cables are not necessarily what they seem. It make look like a 20 pin ribbon cable, but if you examing it you will find that a couple of 'wires' are jsut plastic, no conductor. Thos pins are not connected (they have signals on both the drive and logic board headers, but not the same signal, they muc not be joined). This led me a merry dance.... -tony