kma8080@ihu1g.UUCP (sabalaskey) (08/27/85)
I have a TRS-80 model I (yes, a model I, vintage early 1978). I recently bought a third disk drive at a flea market which seems to work. It is an MPI 51-S drive (I think identical to MPI-51B), which has 40 tracks and is Singe Sided Double Density. I already had drives 0 and 1 of the same type. My problem is that I can get it to work as drive 0, but not any other drive, 2 or 3. There is a shorting bar for drive select, but I dont have the schematics to know which bars to set for what. My previous drives had been set by the company that I bought them from. One final Note: I have a 4-drive addressed cable, where the select leads (pins 10, 12, 14, and 32 on the connector) on the cable only go to one drive each. Does anyone have: 1) schematics of the MPI 51-S or MPI 51-B drives 2) knowledge to allow me to set the straps appropriately Any help is greatly appreciated. Bruce Sabalaskey AT&T Bell Labs ihnp4!ihu1h!saba or ihnp4!ihu1g!kma8080 (312) 979-6622 before 5PM (312) 690-2864 after 6PM