SIMM Memory for RS/6000

SIMM for RS/6000

N = Doesn't fit
S =  64 bit memory-bus = Cards don't have to be paired.
P = 128 bit memory-bus = Cards must be paired.
Q = 256/128 bit memory-bus = Cards either in groups of 4 but in pair to
    (=meaning performance-loss).

                   355/360/36T/365/370/37T/375                   
             3 3 3 | 5 5 5 5 5 5 5 5 5 5 9 9 9 9 9 7 7 7
             2 2 4 | 2 3 3 4 5 5 6 7 8 8 3 5 7 8 9 3 4 7
             0 E 0 | 0 0 H 0 0 L 0 0 0 H 0 0 0 0 0 0 0 0
             | | | | | | | | | | | | | | | | | | | | | |
SD1   S1     S S N N S P N N N N N N N N P N N N N P S N
HD1   S1.5   S S N N S P N N N N N N N N P N N N N P N N
HD2   U1     N N N N N N N Y N N N N N N N N N N N N N N
HD3   S3.1   N N S N N N P N P N N N N N N P N N N N N N
HD3   S3.2   N N S N N N P N P N P N N N N P N N N N N N
HD3   S3.3   N N S S N N P N P S P S P N N P P P N N N S 
HD3   S4.5   N N S S N N P N P S P S P Q N P P P Q N N S
               | |   |               | |     | |     | |
               3 3   5               5 5     9 9     7 7
               2 5   2               8 9     7 8     4 7
               H 0   H               F 0     B B     1 1

Cards are identifiable by the following table:

FRU P/N:
 59F4433  S1
 81F8926  S1.5
 71F1395  S3.0                                    
 00G2208  S3.1
 32G1022  S3.2
 32G1866  S3.3
 65G1803  S4.5
 52G4729  S4.5
 52G4670  S4.6
 12H1331  S5.0

The biggest difference between the memory-cards are what type of SIMM's
they support and the voltage they require:
                                                                                
      Memory      Voltage    Voltage    DRAM
      Card        Mem Card   SIMM       Spec
     8/16mb SD1   5.0-volt   5.0-volt   80-ns 1mbit
    32/64mb HD1   5.0-volt   5.0-volt   80-ns 4mbit
     32mb HD2     3.6-volt   5.0-volt   80-ns 4mbit
      8/16/32/    3.6-volt   5.0-volt   85-ns 2mbit
     64/128 HD3   3.6-volt   5.0-volt   80-ns 4mbit
    128mb HD3.3   3.6-volt   5.0-volt   60-ns 16mbit
    256mb HD4     3.6-volt   5.0-volt   60-ns 16mbit

Note: All cards for 7012/7013/7015 must have 40-bit (ECC) SIMM's so
there's no use to try ordinary PC (36-bit) SIMM's.