On October 11, you wrote:
> I've verified everything and I've found a sick disk (RA70) and a dead TK70.
> I've repaired the TK70. But the disk does not look healthy.
> 
> What is this disk? it is not SCSI, not ESDI, not MFM...
> what the hell is this? Q-bus!?

  Qbus is the bus in the machine; nothing to do with the disk.  The
disk has an SDI interface, and would be controlled by a KDA50 disk
controller in a qbus system.


                         -Dave McGuire