Re: Hypertape not working on IIgs

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

In article <012506ONHICFCAVNPEDE@wbb.com>,  <mcfudge@wbb.com> wrote:
> 
> I have tried to get this tape drive to work with my original Rev C SCSI
> card, and have had no luck for two weeks.  I have two hard drives on the
> SCSI card and I've come across several strange situations:

So the tape drive was plugged in at the same time as the hard drives?

The firmware in the original Apple SCSI card does not support a tape
drive, so if it has a higher SCSI ID than the hard drives, you will
run into problems.

It should be OK if the tape drive has the lowest SCSI ID - the
firmware will probably ignore it.

> 1) When I switch the GS on, it does nothing after displaying the "Apple
>    IIgs" screen... it just hangs.
> 
> 2) Although I always have my startup slot set to 7 for the SCSI card,
>    the hard drive does not boot.  Instead, either of my 3.5 or 5.25
>    drive will attempt to boot.

This means that the SCSI card didn't find a hard drive.  You might not
have waited long enough in this case for the drives to be ready.
There is another possibility - see below.

> 3) System 6.0 will boot -- i.e. the thermometer bar will fill completely
>    then the system will hang.
> 
> 4) System 6.0 will boot (off the hard drive) as if nothing were wrong.
> 
>    I can open and close folders, but when I try to launch any
>    application, the system hangs.  In this instance, while GS/OS is
>    booting, each of my floppy drives will be recognized, then the
>    tape drive will be recognized at which time it will take 5 minutes
>    to spin the tape, then booting will resume.

All of these sound like problems with SCSI termination, termination
power, or bad assignment of SCSI IDs.

> In addition to the SCSI terminator being on the tape drive, I did
> remove the terminators from the hard drive. 

With the original Apple SCSI card, you need two external terminators.
One should be connected between the computer and the first device, and
the other should be connected after the last device.

(Internal termination in the first and last device is OK.)

At least one device must supply termination power.

> The tape drive has a simple SCSI ID selector (push-button), but the two
> hard drives have the standard 8 or 10 pin jumper posts (Seagate drives).
> I have no idea about how to identify what SCSI ID the device has by
> looking at the jumpers.... can anyone help me with that?

No.  You'll probably find that three pair of pins are used to set the
SCSI ID, but I can't tell you which three.

If there are no jumpers on either drives, then both will be set to SCSI
ID 0, and you will get all sorts of problems.


By the way: System 6.0.1 can tell you the SCSI ID of a drive if you
use the Icon Info function in Finder, and click on the "where" tab.

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