#-Reference / Memory Specifications

Pin 72 to Pin 70, 69, 68 and 67 ( X = connected to GND)
For more details see Memory-Presence Determination

#	Type	FRU P/N	MFG P/N	OPT P/N	Size	nS	Key
06	P	90X8624	68X6065 68X6245 65X6264 23F9173 23F9233	6450603	1M	85	X..X
07	P	92F0104	68X6127 4195816 6450604 65X1309 65X5804 65X6170 65X6197 65X6249 0701600 65X2429 82F5506	6450604 92G7196	2M	85	X.X.
14	P	92F0103 15F7658	65F5806 65X6198 65X5806	6450608	2M	80	.XX.
15	P	92F3337	68X6343 63X6384	87F9977 92G7199	4M	80	XXXX
16	P	64F3607	68X6344	6450129 92G7428	8M	80	.XXX
22	P	92F0102 64F3604	71F7008 87F5041	6450902 92G7198	2M	70	..XX
23	P	92F0105	71F7010 64F3605 31F2314 40G6055 78G9176	6450128 92G7200	4M	70	X.XX
24	P	64F3606	71F7011 78G9177	6450130 92G7202	8M	70	.X..
25	ECC	92F0097	42G3072	6451158	4M	70	X.XX
26	ECC	92F0098	42G3073 74G1105	6451159 92F7208	8M	70	.X..
38	High-Rel.	71G6203			4M	70	X.XX
39	High-Rel.	71G6204			8M	70	.X..
46	ECC	96F9100	42G3237	92G7209	16M	70	.X.X
71	ECC	06H7761			16M	60
72	ECC	06H7762		92G2941	32M	60

OEM-Memory (Substitute VENDOR SIMMs) Specifications
(for details see also above reference-list and same #)

#	Type	FRU P/N	OEM Number	Size	nS
07	P	92F0104	MNB36512S85 THM365120S-85 MSC2321-85YS18A HB56D512361B-8 1600A53R1466 9011HCK 9011HAK 365120AFG TC514256A TC51256T 80 MN4B36512S85 MN41C42565J MNSC2321-85YS18A	2MB	85
14	P	92F0103	A25069180	2MB	80
16	P	64F3607	MSC2351-8AYS24AIB-7	8MB	80
22	P	92F0102	THM365120ASG-70 HM365120ASG-70 KMM536512BG-7 MSC2321-70YSI6A	2MB	70
23	P	92F0105	94-VOHB56D00136IB-7	4MB	70

Memory-Presence Determination

(For MEMORY component define, you will have the need to know about 70 or more timing/temperature parameters. Because this information will not fit on a SIMM normally only P/N / Speed and Size is printed on a small Label). 

SIMM Identification (Single Inline Memory Module) 
72-pin memory SIMMs are usually marked with a label that shows the size and speed (e.g. 1Mx32, 60ns). To determine the SIMM capacity from the above example, divide 32-bits by 8 (1-byte) and multiply this result by 1M, hence, SIMM = 4MB (SIMMs prefix -6R = RAS max. 60ns and Reduced CAS-timing (-2ns) appr. CAS = 19ns) 
XMx32 is Non parity  and XMx36 is Parity . 

PS/2 72-Pin SIMMs (for M/T 85xx/95xx) 
A set of 4-Bits shows the state of the presence detect signals for a specific memory connector. The setting of the presence-detect bits is determined through registers (x'00E8' and x'00E9'). 

Not all of the following Memory-modules are supported by every IBM computer.

Pin 72 to Pin 70, 69, 68 and 67 ( X = connected to GND) 

Presence-Detect Bits table

Bits. 3 2 1 0	Measure -ment	Single Inline Memory - Module Definition
1101	..X.	32MB 60-ns Industry standard
1001	.XX.	32MB 70-ns Industry standard
0101	X.X.	32MB 80-ns Industry standard
1110	...X	16MB 60-ns Industry standard
1010	.X.X	16MB 70-ns IBM and Industry standard
0110	X..X	16MB 80-ns Industry standard
1011	.X..	8MB 70-ns IBM and Industry standard
1000	.XXX	8MB 80-ns IBM and Industry standard
1000	.XXX	4MB 70-ns Industry standard
0100	X.XX	4MB 70-ns IBM
0100	X.XX	4MB 80-ns Industry standard
0000	XXXX	4MB 80-ns IBM
1001	.XX.	2MB 70-ns Industry standard
1100	..XX	2MB 70-ns IBM
0101	X.X.	2MB 80-ns Industry standard
1001	.XX.	2MB 80-ns IBM
0101	X.X.	2MB 85-ns IBM
1110	...X	2MB 100-ns IBM
1010	.X.X	1MB 70-ns Industry standard
0110	X..X	1MB 80-ns Industry standard
0110	X..X	1MB 85-ns IBM
0010	XX.X	1MB 100-ns IBM
1111		Connector is empty