🚀 go-pugleaf

Szymon Sokol (szy...@uci.agh.edu.pl) wrote:
: Grzegorz J. Blinowski (g...@ogg.ii.pw.edu.pl) wrote:

: : Szczegolnie irytuje mnie fakt, ze RAMy do starych stacji SLC, ELC, itd.
: : sa potwornie drogie, rozumiem, kwestia wielkosci rynku, marketingu etc.
: Cos mi sie majaczy, ze do SLC (byc moze ELC tez?) pasuje RAM od PS/2 
: (tzn. te SIMMY, ktore w tej chwili opanowuja rynek PC...). 
: Podobnie normalne "stare" SIMMY do PC (4MB 9bitowe) pasuja do SS2, i do 
: SS6x0.
: --

Kilka lat temu przerabialem upgrade SIMMow do SLC.
Byc moze komus przydadza sie moje notatki ... ;-)

--w

>From: Wojtek Sylwestrzak <W.Sylwestrzak>
Subject: Re: ELC/SLC SIMMs (fwd)
Date: Wed, 18 Aug 1993 16:23:25 +0200 (MET DST)

I have made some inquiries regarding SLC SIMMS some time ago.
Generally the answers were ... various.
There is supposed to be a kind of 4MB simms that fits both stations.
As well as some that don't.
A year ago we had many problems expandin memory of our SLCs,
and then we would be more than happy to buy the SIMMs from you.
Perhaps there are others in this situation ?
I think in few years it'll be very difficult to buy the SLC SIMMs.
And still not everyone wants to upgrade to new (or newer) Suns
(as these mostly seem to work worse then the ol'good ones ;-)).


> Summary: (sorry, I don't remember exactly who said what)
> 
> ----
> 
> Sorry for the confusion.  SLC memory chips have a different pin out from
> ELC memory chips.  Sun's and 3rd party chips are not interchangeable.
> 
> 3rd party SLC memory chips are okay.  3rd party ELC memory chips were flakey.
> 
> If you are planning to keep your SLC machines like we did, I recommend you
> in an attempt to get every one to upgrade to ELC or better.  They are using
> them for people who have hardware support contracts.
> 
> Sun was an excellent company while it was run by software people now marketing
> types are in charge and the customer screwing has begun.
> 
> 1950 enterpreneurs ran companies
> 1960 engineers     ran companies
> 1970 accountants   ran companies
> 1980 marketing     ran companies
> 
> ----
> 
> There might be a difference between SIMMs used in the SLC and ELC (speeds of
> 70 and 80 nanoseconds).
> 
> ----
> 
> The maximum memory in an SLC is 16 meg.  
> It will only use 36 bit wide memory.  
> The ELC typically uses 33 bit wide memory.
> 
> ----
> 
> I tried two things:  The Sun rep. supplied 16M SIMMS for the ELCs.  First I
> tried these on their own in the SLCs.  The self-test worked OK but I got
> parity errors (lots of them !) during the UNIX boot sequence.  Then I tried
> putting 2x4M SIMMS (from the ELCs) into the SLCs...same thing happened.  The
> Sun guy checked it out when I pointed out our obvious distress at this situation
> and said that the techies in Sun had confirmed that ELC memory won't work in
> an ELC.  Sorry the news couldn't be more positive.
> 
> ----
> 
> There is a differencs between SIMMs from SLC and ELC. It is possible to
> use ELC SIMMs in an SLC but not in the other way.
> 
> ----
> 
> the 4MB simms are interchangeable
> between SLC <-> IPX <-> ELC
> 
> ----
> 
> You can do it the other way, though. I.e. SLC memory (4MB SIMMS) will
> work in an ELC, but ELC memory (4MB or 16MB SIMMS) will NOT work in an
> SLC (I have tried it!).
> 
> ----
> 
> Yup, the ELC uses 4 or 16 by 33 bit simms part numbers 501-1812 and 501-1822
> respectively, the SLC uses 4 by memory part numbers 501-1676 or 501-1698.
> 
> ----
> 
> SLCs run slower. So, ELC SIMMs will work in SLC but not vice-versa. also, IPX
> SIMMs will work in either the ELC or the SLC.
> 
> ----
> 
>         Some of the SIMMS are compatible but not all.refer to the chart below Ihave drawn up with reference to the machine type and the SIMM part number..
> 
> SIZE    SIMM P/N        SLC     ELC
> 4Mb     501-1676        yes     No
> 4Mb     501-1698        yes     yes
> 4Mb     501-1812        no      yes
> 
> ----
> 
> we have an ELC SIMM that doesn't work with SLC board.
> We received them with ELC from SUN.
> Part No. 501181201
> Chip :
>  -----------------
>  |  M5M44400AJ   |
>  |  115SD5Z-8    |
>  |  JAPAN        |
>  -----------------
> 
> ----
> 
> The ELC and SLC do use different type of memory. The SLC uses standard 8 bit
> word length simms and therefore require 4 simms per bank and the ELC uses
> 32 bit word length simms and therefor only requires one simm per bank.
> 
> ----
> 
> You can buy SLC memory, and put them in ELCs.  SIMMS must be 36 bits wide.
> If you have an ELC SIMM, it could be 33 bits wide, hence not work in
> an SLC.
> 
> ----
> 
> That's all
> 
> best wishes,
> Wojtek
> 


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