9 Dec
2007
9 Dec
'07
12:47 a.m.
Well, I can tell you that MPI made 100 tpi FH drives--I have two of
them on my shelf here, date codes are 81-82. Unfortunately, the
labels have dried up and dropped off, so I no longer have any idea of
what their part number is. I've also got a couple in another
machine, but it's a bear to get at them.
Does the drive have a little "daughterboard" plugged into the main
PCB with a 74ls123 on it? That'd be the "Drive Ready' circuit. I
don't know if all MPI 100 tpi drives had this though.
"Micropolis" type 100tpi drives also have a slightly different pinout
than normal "Shugart" type drives (this includes the Tandon TM-100-
4M). A big difference is that READY is pin 6, not 34. Maybe that's
what's causing your drive error.
Just guessing...
Cheers,
Chuck