Hi, Ulli:
I made good experience with the SRQD11 Controller for ST506 (=MFM) disks
made by the Australian Webster Computer Corporation.
I never heard about it. What's about obtain one today ?
Another good choice would be an Emulex QD21 for ESDI disks or even an Emulex
UC07 for SCSI disks (if you find one).
I take note. Just today I've located finally in my basement one box of Qbus
boards that came to me a couple of years ago together with one of my PDP's.
I shall check the existence of the QD21, but I'm sure that I don't have one
UC07.
Thanks and Greetings
Sergio