[rescue] Sun 3/160 and CADDStation 32 deskside

[Romain Dolbeau]

Le mar. 3 juin 2025 à 09:11, Romain Dolbeau <romain at dolbeau.org> a écrit :
> I don't have a definitive answer, but the Sun Hardware FAQ says in part 1:
> 2/160 => "2/160 upgradeable to a 3/160 by replacing the CPU board"
> 3/160 => "Upgradeable to a 3/260 by replacing  CPU and memory boards."
> 3/260 => "Upgradeable to a 4/260 by replacing the CPU board"

After playing a lot with the ROM and the Sun 3 architecture, there's a
reason for which the 3/260 won't share memory boards with the 3/160:
parity vs. ECC.

* Carrera (3/160) and Prism (3/110) PROMs are hardwired to use parity.
* Sirius (3/260) PROM is hardwired to use ECC.

The architecture manual
(<http://www.bitsavers.org/pdf/sun/sun3/Sun-3_Architecture_Manual_Ver_2.0_May85.pdf>)
permit both, but with the ROM selftest won't allow the use of the
"wrong" type.
In theory one might rebuild a PROM with that part changed to
accomodate whichever board, but that's probably more effort than just
tracking the appropriate board.

Cordially,

-- 
Romain Dolbeau