🚀 go-pugleaf

In <584ee5$5rk@kannews.ca.newbridge.com> msteven@Newbridge.COM (Michael Stevens) writes:

>Would anyone know if it is possible to run multiple
>Sun 3 cpu cards on a single Sun 3/260 box?

>I'm not that concerned if SunOS gets upset, but
>basically whether the boot ROM code will get upset.

Ok, in practise it is possible to run more than one VME CPU board, 
however you have to modify the backplane to avoid contentions on the P2 
memory bus, etc.

The only CPU's you can run without worrying about this are 3/50's and
3/60's which just have the power supply connector but not the other two
(they don't actually have any VME bus support - they're just in the same
form factor). In a 12-slot cage you can run up to 6 of these. 

You could have limited success with CPU boards that don't support ECC RAM
boards. CPU's like the 4/1xx, 4/3xx, etc. which use SIMM's for RAM instead
of ECC RAM. However you might still have problems with contention for any
other non-CPU VME boards you install in the chassis. 

The only genuine Sun multi-CPU board for a VME cage is the 4/6xx, which is
a Sparc board that takes Mbus CPU modules, so this isn't the same as
putting multiple CPU's onto the backplane since they sit on the one card. 

Regards,

Craig.

-- 
        Craig Dewick - craig@zeta.org.au - http://www.zeta.org.au/~craig  
            Professional Train Driver. Located in Sydney, Australia.
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