David Empson schrieb:
The original ST506 interface (as used in the ProFile, for example) uses
two ribbon cables. One is 34 pins, and is basically the same as the
floppy drive interface used in the PC. The other is about 20 pins, and
carries parallel data to/from the drive.
Unfortunately Apple didn't use a MFM drive with ST506 interface for
their ProFile. They took only the Seagate ST506 drive mechanism (ST412
will work, too) and fitted it with their own analog board. This board
ist the only ECL logic circuit I ever met up to now.
ST506 drive and analog board are controlled by the Profile logic board
in a Disk II-like way (phi0..3, RD, WD, WE, and GCR recording).
Patrick