Re: Using System 6.0 with Rev C SCSI

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

In article <20249UWHIFLWYBXSYXM@wbb.com>,  <mcfudge@wbb.com> wrote:
> 
> Thanks to the help of Apple II users here, I finally have my GS equipped
> with an external 62 mb SCSI hard drive.  You guys are great.  :)
> 
> It seems that the Rev C SCSI card does not like the SCSI driver and SCSI
> Manager that come with system 6.0  ( I do not have 6.0.1 yet ).

Both 6.0 and 6.0.1's SCSI drivers worked OK for me with the old SCSI
card.

I did have a problem, though.  With one drive of mine (a partially
faulty Rodime that has a long pause when the SCSI bus is reset) the
drive works fine with the High-speed SCSI card, but with the old SCSI
card it only works properly with the System 5.0.4 drivers.  If I use
the 6.0 or 6.0.1 drivers, the boot sequence fails when the drivers are
loaded.

I think this is due to some kind of timeout waiting for a response.

The card worked fine with the other drives I tried (a year old Quantum
and a SyQuest 44MB drive) and the 6.0.1 drivers.

> Can I safely use System 6.0 with the SCSI Driver and Manager from
> 5.0.4? 

They might work, but I would strongly recommend NOT doing this.  There
may be some differences in the driver mechanisms, particularly at the
supervisory level (SCSI Manager).  Definitely don't try to use System
6.0's Advanced Disk Utility with the 5.0.4 drivers - use 5.0.4's
instead.  Don't mix the 5.0.4 manager with the 6.0 drivers (or vice
versa).

> Now that I have completely installed 5.0.4 on my hard drive, I want to
> replace it with 6.0.  How do I do that?  Will 6.0's Installer
> automagically delete all 5.0.4 stuff while replacing it with 6.0?

Yes.  Use "Easy Update", or a full installation via the "Customize"
button (choose "System 6:Hard Disk or FDHD").

If you have any third-party addons (INITs, etc.) they will be left
alone.  Any files supplied with System 5.0.4 that are no longer
required (e.g. CDEV.Init) will be deleted, and most of the other
system files will be replaced with newer versions.
-- 
David Empson
dempson@actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand