8 May
2002
8 May
'02
7:06 p.m.
On May 8, 17:34, Robert Schaefer wrote:
No, Indys can use any mix of 4MB, 8MB, 16MB, 32MB SIMMS, and they (and
Indigo2 and R4000 Indigo) take standard 72-pin fastpage-mode parity SIMMs.
There's a bug in the ASIC (according to SGI) on the 64-pin proprietary
SIMMs which means you can use any number of 2MB or 8MB SIMMs but only one
set of 4MB SIMMs on a 4D/35 or R3000 Indigo.
--
Pete Peter Turnbull
Network Manager
University of York
----- Original Message -----
From: "Corda Albert J DLVA" <CordaAJ(a)nswc.navy.mil>
on one side of
the simm. Did someone already mention that
you can only have 1 bank of 4Mb simms in a system, due to
a prom bug? There is no restriction on the number of other size
simms.
Isn't that just the Indy, or something? I remember reading it, but it
didn't (that I recall) mention the 4D/35. That does jive with the only
machine that has 4MB simms in it though-- only one bank (four SIMMS). 
8 May
8 May
11:19 p.m.
----- Original Message -----
From: "Pete Turnbull" <pete(a)dunnington.u-net.com>
To: <classiccmp(a)classiccmp.org>
Sent: Thursday, May 09, 2002 03:06 AM
Subject: Re: IRIX on Personal Iris
No, Indys can use any mix of 4MB, 8MB, 16MB, 32MB
SIMMS, and they (and
Indigo2 and R4000 Indigo) take standard 72-pin fastpage-mode parity SIMMs.
There's a bug in the ASIC (according to SGI) on the 64-pin proprietary
SIMMs which means you can use any number of 2MB or 8MB SIMMs but only one
set of 4MB SIMMs on a 4D/35 or R3000 Indigo.
Well, these SIMMS sure do have the ASIC on 'em. 120 pin QFP if I have my
outlines right, takes up 1/3 of the back side of the SIMM! At least 8MB
SIMMs aren't affected.
--
Pete Peter Turnbull
Bob
9 May
9 May
2:17 a.m.
On Thu, 9 May 2002, Robert Schaefer wrote:
Well, these SIMMS sure do have the ASIC on 'em. 120 pin QFP if I have my
outlines right, takes up 1/3 of the back side of the SIMM! At least 8MB
SIMMs aren't affected.
Hmmmm. Is there a scan of these creatures around? This is
starting to sound like something I've seen recently.
Doc
3:03 a.m.
On Thu, 9 May 2002, Robert Schaefer wrote:
I don't recall seeing a picture anywhere offhand. I can scan 'em in, but
that'll mean digging up the CD the scanner came with.
They're 64 pin (IIRC, didn't count), ~1.5" tall, ~3" long, keyed on one
end
just like 30 pin SIMMs. The 2MB have one side full of SOJ RAM, the flip
side has the ASIC and a good number of SMD caps I think they are, including
one rather large. The 4MB have only the middle half of the RAM chips
installed, the ASIC on the back, and I presume a similar number of caps as
well. I haven't seen the 8MB flavor, but it should be the same as the 4MB
except all the chips installed.
I know of at least three people who'd like a full set of 16, as well as
keyboards and mice, if you come across any. Somehow, I don't think they're
that common any more though. Incidentally, I did see a 32MB kit of SGI-
branded 8MB SIMMs offered by one of the online memory vendors for ~$100/ea.
Well, these SIMMS sure do have the ASIC on 'em. 120 pin QFP if I have
my outlines right, takes up 1/3 of the back side of the SIMM! At
least 8MB SIMMs aren't affected.
Hmmmm. Is there a scan of these creatures around? This is
starting to sound like something I've seen recently.
Doc
Bob
3:47 a.m.
On Thu, 9 May 2002, Robert F Schaefer wrote:
They're 64 pin (IIRC, didn't count),
~1.5" tall, ~3" long, keyed on one end
just like 30 pin SIMMs. The 2MB have one side full of SOJ RAM, the flip
side has the ASIC and a good number of SMD caps I think they are, including
one rather large. The 4MB have only the middle half of the RAM chips
installed, the ASIC on the back, and I presume a similar number of caps as
well. I haven't seen the 8MB flavor, but it should be the same as the 4MB
except all the chips installed.
This all sounds very like what I've seen.
I know of at least three people who'd like a full
set of 16, as well as
keyboards and mice, if you come across any. Somehow, I don't think they're
that common any more though. Incidentally, I did see a 32MB kit of SGI-
branded 8MB SIMMs offered by one of the online memory vendors for ~$100/ea.
I never bother with common. :)
Seriously, I saw the sets I'm thinking of in one of 2 places. One
shop has provided memory for my PS/2s (with MCA RAM board) DECstation
3100 and my vs4000/60, the other such niceties as 32M sticks for a SS5,
8M ??? for my HP 9000/735, and 64M modules for an HP B132. If I can get
a good look at what you need, I'll end up in both shops within a week or
2 anyway. Model/Part numbers won't help as much as pictures.
Doc
4:38 a.m.
I know of at least three people who'd like a
full set of 16, as well
as keyboards and mice, if you come across any. Somehow, I don't think
they're that common any more though. Incidentally, I did see a 32MB
kit of SGI- branded 8MB SIMMs offered by one of the online memory
vendors for ~$100/ea.
I never bother with common. :)
Seriously, I saw the sets I'm thinking of in one of 2 places. One
shop has provided memory for my PS/2s (with MCA RAM board) DECstation
3100 and my vs4000/60, the other such niceties as 32M sticks for a SS5,
8M ??? for my HP 9000/735, and 64M modules for an HP B132. If I can get
a good look at what you need, I'll end up in both shops within a week or
2 anyway. Model/Part numbers won't help as much as pictures.
Doc
Bob
1:02 a.m.
On 2002.05.09 09:06 Pete Turnbull wrote:
There's a bug in the ASIC (according to SGI) on
the 64-pin
proprietary SIMMs which means you can use any number of 2MB
or 8MB SIMMs but only one set of 4MB SIMMs on a 4D/35 or
R3000 Indigo.
So, if I "upgarde" the 4MB SIMMs to 8MB SIMMs, I can put in
more than
one bank of "upgraded" SIMMs? Or is this bug speciffic to the 4MB SIMM
ASIC and the 2MB and 8MB SIMM ASICs are different?
--
tsch??,
Jochen
Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/
1:50 a.m.
On 2002.05.09 09:06 Pete Turnbull wrote:
The 2 meg SIMMS are full o' chips, the 4 meg SIMMS are only half-populated,
fill it out to make an 8 meg SIMM. It would appear that the ASIC is the
same on the 4 meg and 8 meg SIMM. I would like to know if the ASIC is the
same on the 2 meg SIMM. I have a number of them, and I would rather
unsolder the old RAM chips and replace them than screw with the only set of
working 4 meg SIMMs I have.
There's a bug in the ASIC (according to SGI)
on the 64-pin
proprietary SIMMs which means you can use any number of 2MB
or 8MB SIMMs but only one set of 4MB SIMMs on a 4D/35 or
R3000 Indigo.
So, if I "upgarde" the 4MB SIMMs to 8MB SIMMs, I can put
in more than
one bank of "upgraded" SIMMs? Or is this bug speciffic to the 4MB SIMM
ASIC and the 2MB and 8MB SIMM ASICs are different? --
tsch??,
Jochen
Bob
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doc＠mdrconsult.com -
jkunz＠unixag-kl.fh-kl.de -
pete＠dunnington.u-net.com -
rschaefe＠gcfn.org