🚀 go-pugleaf

Craig Dewick <cdewick@lios.apana.org.au> writes:
> > I have recently acquired an IPX (Sparc 4?) running SunOS 4.1.  As it only
> > has 16MB of RAM, and has 3 nice 72pin simm slots available, I stuck in
> > some EDO RAM (what the heck!?8-).
> 
...
> > doing wrong -- like perhaps I need proprietary RAM?? 
> 
> You don't need proprietry RAM. Regular non-EDO 4 or 16 meg 72-pin parity
> (33-bit) SIMM's will work. I'd be surprised if EDO SIMM's will work
> properly in any Sun machine, but I guess it depends on the limits of the
> DRAM controller hardware.
> 
> You might like to try, just for the sake of experimentation, removing the
> original SIMM if it's non-EDO (I'd guess that it is non-EDO) and
> installing just the EDO SIMM(s) to see what happens. 

I believe the key is the Parity.  As far as I know EDO SIMMS are not
parity, and the IPX requires parity SIMMS.  As an aside I also seem to
remember the EDO memory is sort of backward compatible in that it will
work in non-EDO aware machines (you just don't get the benefit)

Jim

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