[rescue] Sun 3/160 and CADDStation 32 deskside

[Romain Dolbeau]

Le mer. 13 août 2025 à 20:34, Alan Perry <alanp at snowmoose.com> a écrit :
> I have since found that I have a 3/160 memory board to add to the 4M on the 3/160 board I am using in the CADDStation. However it is broken and I am trying to debug it.

Good luck!

You probably already found that info, but just in case...
The SUN 3/160 itself has some documentation on bitsavers:
* schematics: <https://bitsavers.org/pdf/sun/sun3/3-100/Sun-3_160_Schematic_Jun88.pdf>
* functionam overview:
<https://bitsavers.org/pdf/sun/sun3/3-100/Sun-3_160_Functional_Overview.pdf>
The second one calls the CPU board 2060, which also has some documents:
* Hardware reference manual:
<https://bitsavers.org/pdf/sun/sun3/3-100/800-1370-02_2060_CPU_Hardware_Reference_Manual.pdf>
* Engineering manual:
<https://bitsavers.org/pdf/sun/sun3/3-100/800-1386-13_2060_CPU_Engineering_Manual.pdf>
There's also documents on how to place/configure the board in various
VME systems.

Unfortunately bitsavers doesn't appear to have documents pertaining to
the memory boards themselves.

But the CPU board documents clarify that the CPU accesses the memory
board via the P2 bus, an extension to VME that Sun wired on the
user-defined pins of the VME"s P2 connector and their own P3
additional connector.
So for the memory board and CPU board to communicate, they need to be
placed in appropriate slots of an appropriate VME backplane. And other
boards need to be placed in a way that match the requirements not just
of the VME bus, but also the P2 bus, to enable use of the P2 and/or
avoid conflicts.

Cordially,

-- 
Romain Dolbeau