24 Oct
2000
24 Oct
'00
7:16 a.m.
Ethan Dicks wrote:
Ok. What I was trying to do was to mount it on a system that
has IDE drives, so that SCSI ID zero was free. But the powerbook 660
failed to mount it. Note that it works fine in the original Mac 512K.
--- Carlos Murillo-Sanchez <cem14(a)cornell.edu> wrote:
Here's a picture:
http://huey.ee.cornell.edu/omti3100.jpg
I have this old Mac SCSI drive+enclosure, a
Dataframe 20 model.
My Mother had some Dataframe 20s with the OMTI 3100 MFM<->SCSI
card inside.
Does anybody know how to set the SCSI id for this
bridge?
Not without looking at a picture of the card. 
Will it look
like a standard SCSI device to another apple, or
is this a non-standard beast?
AFAIK, it is just a standard, pre-SCSI-2 interface. You will *not*
be able to issue IDENT commands against it to divine the drive
geometry. You have to _know_ the heads/tracks/sectors of the MFM drive
(there are lists of those out there - I was just looking up the XT2190
today and only found 47 hits with Altavista - it's a good keyword to
use to find MFM drive lists) The problem is probably the third-party controller.
It may or may not
count on a certain set of contents of the first cylinder or two. With
the right driver disk, you could reformat that drive on a more modern
Mac, but you want data recovery.
I see. If this is the case, then, I'm afraid that the only recovery
route is 25 x 400k floppies.
If you can't change the SCSI id of the Hardframe,
why not change the id
of the boot disk in your target Mac?
Oh, it is an easy-access issue. I could do this on a IIci or an SE/30.
But the IIci's drive cost some effort to put in place, since it is
a 68pin model, and with the 50 pin adapterit barely fits in the bay.
And the SE/30... well, I was trying to avoid opening it. I try to
open compact macs only as a last resort, since there is always a
chance of breaking the CRT neck. Much better to change the SCSI id
in the OMTI board if possible.
Carlos.
--
Carlos Murillo-Sanchez email: cem14(a)cornell.edu
428 Phillips Hall, Electrical Engineering Department
Cornell University, Ithaca, NY 14853