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In <1993Jan28.000538.6282@noose.ecn.purdue.edu> chienhua@simplex.ecn.purdue.edu (Chien-Hua Hsiao) writes:


>Please help me to identify which machine can use following simms.

>+---------------------------------+
>| +-+ +-+ +-+ +-+ +-+ +-+ +-+ +-+ |
>| | | | | | | | | | | | | | | | | |
>| | | | | | | | | | | | | | | | | |
>| +-+ +-+ +-+ +-+ +-+ +-+ +-+ +-+ |
>||||||||||||||||| |||||||||||||||||
>+----------------^----------------+
>       |                  |
>    32 pins            32 pins

>These simms have 8 chips on it. The code on the chip is  AAA1M300J-08
>                                                         NMBS    9130
>Are the simms 1Mx8-80NS.

They don't sound familiar to me, at least for ESD's machines.  The 4D/20
and 4D/25 use a 30 pin (100 mil spacing) simm in a 9 bit wide configuration,  
same as many PC clones.  1Mx9-100ns was the most common size.
The 4D/30, 4D/35, and Indigo R3K used a double high simm with a pinout 
that looks like the above drawing (64 pins, 50mil spacing), but with two 
rows of 9 DRAMs (18 DRAMs total), and a custom gate array on the back.  These
were 9 bits wide, two way interleave simms that came in 2M, 4M, and 8M
sizes (the 4M had 10 of the 18 DRAMS stuffed).  These were custom simms 
that were not found on any other computer.  The Indigo R4K and the
Indigo^2 use a 72 pin (50 mil spacing) 36 bit wide simm, as can be
found in certain IBM PS/2 models.

>Thanks in advance. Please e-mail me.


>Chien-Hua Hsiao
>chienhua@ecn.purdue.edu

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steve valin		steev@sgi.com
	   	  It's like deja vu all over again...