Brian D Chase <bdc@world.std.com> wrote:
> The one I have has the following identifiers
> 
> 5017313-01 D1 5417314-02 L1
> PVAX ST-506/SCSI DISK CONTROLLER

This is certainly it! DEC calls it SCSI/ST-506 or ST-506/SCSI, but people often
call it SCSI/MFM because the MFM part is not only for ST-506/412 Winchester
disk drives, but also for SA-400/450 floppy disk drives.

Sincerely,
Michael Sokolov
Phone: 440-449-0299
ARPA Internet SMTP mail: sokolov@alpha.ces.cwru.edu