Re: GS and weird HD problem...

[dempson@actrix.gen.nz (David Empson)]

Bill Brown <macfan@earthlink.net> wrote:

> SCSI card is set to pin #9, which should be SCSI ID 7

I take it you mean that you have the jumper going between pin 9 and the
one below it (pin 8).

> HD has been set to 0, 1, 2, 3, via external switch, 
> also to ID 0 by removing external switch and manually jumpering the blocks...

That's ID 7, not 0.  All three A0, A1 and A2 pins should be left without
a connection for ID 0.

ID 6 would be A1 and A2 grounded, A0 no connection.

Double check your SCSI IDs, and if it still isn't working, try changing
the SCSI card to a different ID: I'd suggest setting the card to 6 and
the drive to 0, to be certain you have them on different IDs.

> Started GSOS 6.0 install, selected quit, launcher then allowed me to start
> advanced disk utility...

Is there any particular reason you are using System 6.0 instead of
6.0.1, or was this just lazy reporting of the circumstances?

> [Two partitions gets echoed seven times, one partition seems to work fine]

If it isn't the SCSI ID, I'd suspect a very odd termination problem.

Do you have the termination resistors (or an external terminator)
connected to the drive?

Is the drive supplying termination power?  Mine does, and if I remember
right this feature was permanently active (unless the fuse has blown).

I've just opened up the case to refresh my memory.  My drive as the "EP"
(enable parity?) jumper closed, but both "SS" (spare shunt) and "WS" (I
forget the function of this) are open.

Termination power passes through a few components that are above the
three jumpers (holding the drive so the white writing on the circuit
board is up the right way, with the SCSI connector at the bottom).

The fuse is a white device labelled F201 on the circuit board.  Just
above this is a capacitor (C203), the positive terminal of which (right
side) goes to the termination power line.  Just below the fuse is what I
think is a diode (CR202), and the right side of this also goes to
termination power.

The termination power line itself is pin 26 on the SCSI connector.  Look
about half way along - there is one pin with a track going to a
feed-through.  This is TERMPWR.

Use a continuity tester to verify that the TERMPWR pin has a good
connection to both sides of the fuse, and to the right side of the other
two components.

Also check that the left side of the CR202 diode comes from the +5V
power input on the drive (the red wire on the four-way power connector).

Also check that the left side of the C203 capacitor goes to ground
(black wire on the power connector).

If all of this is as I've described on your drive, then the drive is
supplying termination power.

-- 
David Empson
dempson@actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand