Revised : 28/9/91@20:13EST
Info on Miniscribe 8425 : 20Mb stepper hard disk

J2  (4 sets of pins)

o--o   Drive select 1
o  o   Drive select 2
o  o   Drive select 3
o  o   Drive select 4


J13  (1 set of pins)
o  o = Diagnostics disabled
o--o = Diagnostics enabled


Fault codes
(I believe these are the same for the 3650??)
 continuous 0.5sec = binary 1
 flashing for 0.5sec = binary 1
 bits separated by 0.3sec off
 codes separated by 1.0sec off

0000    Microprocessor RAM error
0001    Microprocessor ROM checksum error
0010    Interface chip diagnostic failure
0011    Write fault latch will not reset
0100    Index pulse not detected during motot spin up
0101    Motor unable to reach 3600rpm in 30 secs
0110    Unable to stabilize rotational speed in 10 seconds
0111    Rotational speed not within 0.5% tolerance
1000    Unable to uncover track 000 sensor
1001    Unable to cover track 000 sensor
1010    Track 000 sensor misadjusted
1011    Shipping zone error, crash stop misadjusted
1100    Carriage stuck during recalibration
1101    Seek error during sequential testing or recalibration
1110    No motor hall sensor transitions during spin-up
1111    Unexpected interrupt from microprocessor

===
File ends