Odd problem with AHA1542B, Archive tape, and Micropolis disk

[Helmut Knirsch]

In article <1990Sep19.042306.261 at esegue.segue.boston.ma.us> johnl at esegue.segue.boston.ma.us (John R. Levine) writes:

>The problem seems to be that the disk is responding to all 8 SCSI addresses.

Some weeks ago we had the same problem.
After a little bit trouble-shooting we found the disk drive delivered with
ID 7. After jumpering ID 0 the problems vanished.

For Micropolis 1684-7, 1684-6, 1683-5, 1683-4, 1375, 1374, 1374A, 1373, 1373A
and 1580 Series the device SCSI ID can be assigned via three jumpers on
Jumper Block 2. This block is located on the rear of the drive next to
the SCSI Bus Connector J1. Normally Pin 1 and Pin 24 of J2 are marked on the
interface board. 

	+-------+
J2:	| 24 23 |
	| ..... |
	| ..... |
	|  6  5 |	ID Bit 2
	|  4  3 |	ID Bit 1
	|  2  1 |	ID Bit 0
	+-------+

	+-------+
J1:	| 50 49 |
	  .....

Remove all Jumpers from ID Bit 0, 1 and 2 to configure SCSI Address 0.
Insert Jumpers 1-2, 3-4 and 5-6 to select SCSI ID 7.

	Helmut