Scan of Micro Peripherals Inc MPI 91/92 Product Manual Avail?

Of course, neither Tandon nor MPI produced a drive that was even close to Micropolis. But almost nobody was as expensive as Micropolis either. Micropolis never gave up, IIRC, on its 4-steps-per-cylinder precision leadscrew setup. I've got a Micropolis 1115-VI drive here and it's a heavy wonder to behold. The whole stepper motor, leadscrew and head assembly pivots on the drive door--usually, the stepper is attached to the main body of the drive. Further, it's a drive that features a microcontroller for drive spindle speed control (no adjustments) as well as for providing a "buffered seek" capability. Fire step pulses at it at rates slower than 6 msec/step and it behaves normally. Fire pulses at between 3-5 msec and the drive goes into buffered seek mode. It's a wonder to behold and, IIRC, was substantially more expensive than anyone else's 5.25" floppy drives. Sort of the antithesis of Jugi Tandon's "make 'em cheap" approach. No wonder Micropolis went out of the floppy business. --Chuck