8" drive variations

On 14 Mar 2007 at 14:33, info wrote: Here's what I've got. DC Power is supplied through the 40 pin header that also carries the interface signals. (AC power is supplied through a separate connector). Be careful not to insert the connector "backwards!" When I talk about SA-800 pins, I'm referring to the corresponding pin on the Shugart SA-800 50 pin connector. 1. All even pins are ground. 2. +5 is applied to pins 1 and 3 3. +24 is applied through pins 9, 11, and 13 4. This drive has a single SELECT/ line on pin 15. That is, there is no address decoding circuitry for multiple drive selects on this model. So, you'd connect pin 15 to one of SA-800 pins 26, 28, 30 or 32 for DS1-4, respectively. 5. DIRECTION/ is pin 5 and corresponds to SA-800 pin 34 6. STEP is pin 7 and corresponds to SA-800 pin 36 7. TRACK 00/ is pin 17 and corresponds to SA-800 pin 42 8. HEAD LOAD/ is pin 19 and corresponds to SA-800 pin 18 9. READY/ is pin 21 and corresponds to SA-800 pin 22 10. TG43/ is pin 23 and corresponds to SA-800 pin 2 11. INDEX/ is pin 25 and corresponds to SA-800 pin 20 12. SECTOR/ (for hard sectored diskettes) is pin 27 and corresponds to SA-800 pin 24 13. The Calcomp has WRITE ENABLED/ status on pin 29; you'll need to invert this and gate with the SELECT/ signal with an OC gate and connect it to SA-800 pin 44 (WRITE PROTECT/) if you want write-enable sensing to work. Otherwise just terminate SA-800 pin 44 with a 150 ohm pullup. 14. WRITE DATA/ is pin 31 and corresponds to SA-800 pin 38 15. WRITE GATE/ is pin 33 and corresonds to SA-800 pin 40 16. I'm assuming that you'll use your own data separator, not the on- drive one. RAW DATA/ is pin 37 and corresponds to SA-800 pin 46. 17. Leave pins 35 (SEP DATA/) and 39 (PLO SYNC/) NC. That should do it. Cheers, Chuck