Re: [IIGS]Hard drive

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

Jerome Vernet <jeromevernet@hotmail.com> wrote:

> My AIIGS got an SCSI CARD (Model 607-0291-C, i think it's a Rev C).

I'm not familiar with the model numbers, but your later description (8
jumper positions) agrees that this is the original Apple SCSI card.

The firmware revision can be identified by looking at the part number on
the EPROM label:

341-0112A is revision A
341-0112B is revision B
341-0437-A is revision C

You need revision C to use the card with GS/OS in a IIgs.

> So I try to connect an external HD that works on my SE/30. I made (on the
> SE/30) two partitions: the first for the mac, the second for the GS (30
> Mb).

This won't work very well.  The IIgs needs to boot from the first
partition, so it would be a better idea to swap them over, with a 32 MB
partition first, and the rest as HFS for the Mac (which can also be
accessed by the IIgs as a data volume, via GS/OS only).

If the drive is large enough, you will probably be better off creating
at least two 32 MB partitions, as that will give you plenty of space to
work with in 8-bit software.

(The exact maximum size of a ProDOS partition is 32767.5 KB, which is
512 bytes shy of 32 MB.)

> But i cannot find on the IIGS any tools to initialize the disk. What tools
> do i need ? Advanced Disk Util don't see the disk.

Some obvious things to check:

1. The slot containing the SCSI card must be set to "Your Card" in the
control panel.

2. You need the SCSI drivers installed on your startup disk.  At a
minimum, you need SCSI.Manager and SCSIHD.Driver, but the safest method
is to use the Installer to set up the system disk as required.

The System 6.0.1 "Install" disk has the SCSI drivers, so booting from it
should allow you to see the hard drive, and it provides a method of
erasing volumes from within the Installer (just make sure you erase the
right one!)

You probably won't need Advanced Disk Utility, as its primary use is for
partitioning a hard drive, and you've already done that on the Mac.
(Partitioning again on the IIgs will destroy the contents of the HFS
partition on the drive, and may render the drive unbootable on the Mac.)

3. The drive must be terminated (using either internal termination or a
piggy-back terminator connected to the back of the drive).  If you are
connecting two or more devices to the original Apple SCSI card, you need
to terminate the first and last devices.

4. Something has to provide power for the SCSI termination.  This is not
a standard feature of older Apple SCSI cards, so it is easiest to use a
drive mechanism which has the option of supplying termination power.
(This is also more reliable, as having the computer supply termination
power may impose a heavy load on the power supply.)

5. The SCSI card and drive must be set to different IDs.  Assuming your
SE/30 has the standard configuration, then the Mac is ID 7 and its
internal SCSI drive is ID 0, so the external drive can be set to any ID
from 1 to 6.  You should set the Apple II SCSI card to be ID 7 (jumper
connecting the innermost pair - pins 8 and 9 on the 16 pin header).

You cannot have both computers connected to the SCSI bus at the same
time.

> What is the use of the 8 jumper at the top of the card.

They set the SCSI ID of the card.  Exactly one pair of pins should be
connected (vertically).  The outermost pair corresponds to SCSI ID 0,
and the innermost pair corresponds to SCSI ID 7.
-- 
David Empson
dempson@actrix.gen.nz