[SunRescue] sparc 5 memory...

[Dave Reader]

On Fri, 9 Feb 2001, Mike Nicewonger wrote:

> The Sparc 5 does NOT take 72 pin memory. It takes 168 pin DIMMs, 5 volt,
> buffered, parity. The only machines I have ever seen that use that memory
> are the SS4, SS5, and X-Terminal 1. Could your mate by chance be smoking
> crack? :)

He said 72 _bit_ not 72 pin.

My immediate reaction to reading it was to think "that should be 36 bit,
surely.." but then I remembered that it is 72 pin simms which are 36 bits
wide... :)

I suspect that the proper sun parts would actually be 66 bits wide? - as
sun usually use just 1 parity bit per 32 bit word. the SS5 dimm which i'm
looking at now would seem to confirm that. 16 big memory chips, 2 little
ones, and 2 buffer chips.

dave.

> 
> Mike N
> ----- Original Message -----
> From: "kebabthesheep" <kebabthesheep at yahoo.com>
> To: <rescue at sunhelp.org>
> Sent: Friday, February 09, 2001 8:24 AM
> Subject: [SunRescue] sparc 5 memory...
> 
> 
> > Hi all,
> >
> > After contacting a mate at sun uk, I was told that the sparc5 takes
> ordinary jedec dimms, of 4x72
> > pin format.  It uses 64 bits of the 72 for data, and 2 for parity.  He
> also said, that he has used
> > PC memory in a sparc5 and visa versa, and that the 'fact' that sparc5 ram
> is special, is just a
> > myth.  (and a profitable one at that)
> >
> > Has anyone any experience of using PC 32Mb parity dimms in a sparc5?  What
> about the sparc4?  I
> > was lead to believe it was a 'cut-down' cheap sparc5, but that somehow
> there *IS* something odd
> > about it's memory requirements.
> >
> > I'm confused by all this - I don't want to spend hundreds of pounds on ram
> for a couple of slow
> > suns, which I was given for free, but equally I want to play with solaris
> 7/8...
> >
> > Dave.
> >
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