8" drive variations

[Chuck Guzis]

On 14 Mar 2007 at 14:33, info wrote:

> Yes those are the ones. Thanks

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