Does anyone happen to have documentation, schematics, or software for the Quay 900? It's a system based on the Quay 90F/MPS single-board Z80 computer and two MPI double-sided 8-inch floppy drives. The drives are MPI part no. 77618022, apparently a 9406 variant but not listed in the drive manual on Bitsavers. I suspect the pinout is close to the SA800/850 pinout (industry standard), but I was surprised to find that none of the variants in the 9406 manual have a pinout similar to that.