[rescue] Dataram 64mb sbus ram expansion

[foo bar]

On Thu, Feb 13, 2025 at 10:46 PM Henry Bent via rescue
<rescue at sunhelp.org> wrote:
>
> On Thu, 13 Feb 2025 at 22:17, William Barnett-Lewis via rescue <rescue at sunhelp.org> wrote:
>>
>>
>> BUT the big surprise that I had forgotten I had was a Dataram 64mb
>> sbus memory expansion (with the all important ribbon cable) from a
>> long gone IPX.
>
>
> I had never seen one of these before.  Apparently they're only for the SS2 and IPX, and require additional power from a special motherboard connector.
>
> What would happen if you put it in a different machine, and were able to externally supply the correct power?  Could this theoretically work in an SS1, or an IPC?

This specific card won't work but the general idea will. On sun4c sbus
is the system bus so the CPU, MMU and memory controller all sit on
sbus. So this card is literally just the same memory controller that's
on the motherboard plus some RAM. The SS1/1+/IPC use an early version
of the memory controller so you'd have to use one of those to make
this kind of card for them. Which is exactly what the sun4e memory
expansion board does as you can see here.

https://www.ebay.com/itm/305846748548