[rescue] Sun 3/160 and CADDStation 32 deskside

[foo bar]

On Tue, Jun 3, 2025 at 10:02 AM Mouse via rescue <rescue at sunhelp.org> wrote:
>
> >> 1. I am using a Sun 501-1164 (3/160) CPU board. It has 4M onboard. Will a S$
>
> Not just the 3/160; at least according to Obsolyte's Sun hardware
> reference, it's the 3/160, 3/75, 3/140, 3/150, and 3/180 as well.
>
> > No, that board will definitely not work with a 3/100 processor.
>
> What prevents it?  I thought VME was VME was VME.

They're not VME, they communicate with the CPU board over what Sun
called the P2 bus. The 2 outer rows of pins on the P2 connector and
the middle row of pins on the P3 connector are unused and user
defined. Sun called it the P2 bus and used it for things like CPU to
memory interconnects, framebuffer to graphics processor interconnects,
and on some of the 12 and 16 slot back planes the middle slot would
connect its P2 bus to the internal SCSI bus and there were special
SCSI boards that had no external connector that would plug into them.