Subject: 72pin SIMM memories
To: port-vax@NetBSD.ORG <port-vax@NetBSD.ORG>
From: John A. Maier <>
List: port-vax
Date: 02/19/2000 00:08:00
I'm sure this question has been asked before but I've looked all over the webpage and found nothing on the subject.

I was going through a 1993 DECdirect hardware catalog and ran across memory options.

The VAXstation 3100, 3520, 2540, 4000, VAX 4000 Model 100, DECsystem 5500 and maybe others use a 72pin style memory SIMM.  DEC listed them as:
MS40 parity 1-Mbit DRAM 8Meg
MS42 parity 4-Mbit DRAM 4,8,12,16Meg
MS44 parity 1-Mbit DRAM 4, 8Meg
MS44 parity 4-Mbit DRAM 32Meg
MS44 ECC    4-Mbit DRAM 16, 64Meg
MS60 ECC    1-Mbit DRAM 16, 32Meg

Though unrelated VAXstations, the DECstations, and VXT2000 also used a 72pin ECC SIMM. DEC listed them as:
MS01  parity 1-Mbit DRAM 4Meg
MS01  parity 4-Mbit DRAM 4Meg
MS01  parity 4-Mbit DRAM 16Meg
MS02  ECC    4-Mbit DRAM 8,32Meg
MS200 unknown       DRAM 2,4Meg
MS220 ECC    4-Mbit DRAM 64Meg
MS220 ECC    1-Mbit DRAM 32Meg

So which of the above are directly compatable with the 72pin memory [at one time] so very popular in PCs?  
Will a VAXstation work with memory void of ECC?  
Are they EDO style memory or Non-EDO?

I'm sure I'm not the first to be tempted by such similarities.