It is a disk controller for MFM disks and a floppy
drive. There was
an RQDX1, RQDX2, and RQDX3. Each supported diffferent models
I was lucky enough to find an RQDX3 for a fair price recently, however
it didn't come with the top cable. If someone could point me to where
there is ribbon construction information (where to split, where to place
the pin 1's etc.) that would be most useful, thanks.
John A.