[rescue] CD ISO, SunOS 4.1.4 & Qemu SS-5

Peter Stokes peter at ashlyn.co.uk
Thu Nov 19 02:58:48 CST 2020


Just my two penny worth, but suspect the ID3 was due to the move from external
to internal drives. Up to that point all drives were external and normally
were set to 0 for the boot drive. When they introduced internal drives maybe
they thought leave the externals as is to allow adding on to the newer

I know you could always change the external Drive ID, but some needed to be
opened up to change physical jumpers if I remember correctly.


Sent from my iPad

> On 19 Nov 2020, at 04:16, Mouse <mouse at rodents-montreal.org> wrote:
> o;?
>> Sparcs were fiddly sysmtems with where things were expected to be on
>> the SCSI bus.  ID3 was the default root drive, [...]
> This depends, though I'm not sure what exactly it is it depends on.
> ROM firmware version, maybe?  Machine type?
> Some systems default sd0 to ID 3 as you say (with sd1 at ID 1, sd2 at
> ID 2, and sd3 at ID 0); others have sd numbers equaling SCSI ID numbers
> for 0-4 by default.  There may be other mappings, but those are the
> only ones I recall seeing personally.  I never learnt what led to their
> swapping 0 and 3 on some systems....
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