72 pin SIMM

SIMM=Single Inline Memory Module

72 PIN SIMM (At the computer)

72 PIN SIMM at the computer.

Pin	Non-Parity	Parity	Description
1	VSS	VSS	Ground
2	DQ0	DQ0	Data 0
3	DQ18	DQ18	Data 18
4	DQ1	DQ1	Data 1
5	DQ19	DQ19	Data 19
6	DQ2	DQ2	Data 2
7	DQ20	DQ20	Data 20
8	DQ3	DQ3	Data 3
9	DQ21	DQ21	Data 21
10	VCC	VCC	+5 VDC
11	n/c	n/c	Not connected
12	A0	A0	Address 0
13	A1	A1	Address 1
14	A2	A2	Address 2
15	A3	A3	Address 3
16	A4	A4	Address 4
17	A5	A5	Address 5
18	A6	A6	Address 6
19	A10	A10	Address 10
20	DQ4	DQ4	Data 4
21	DQ22	DQ22	Data 22
22	DQ5	DQ5	Data 5
23	DQ23	DQ23	Data 23
24	DQ6	DQ6	Data 6
25	DQ24	DQ24	Data 24
26	DQ7	DQ7	Data 7
27	DQ25	DQ25	Data 25
28	A7	A7	Address 7
29	A11	A11	Address 11
30	VCC	VCC	+5 VDC
31	A8	A8	Address 8
32	A9	A9	Address 9
33	/RAS3	/RAS3	Row Address Strobe 3
34	/RAS2	/RAS2	Row Address Strobe 2
35	n/c	PQ26	Parity 26 (3rd)
36	n/c	PQ8	Parity 8 (1st)
37	n/c	PQ17	Parity 26 (3rd)
38	n/c	PQ35	Parity 35 (4th)
39	VSS	VSS	Ground
40	/CAS0	/CAS0	Column Address Strobe 0
41	/CAS2	/CAS2	Column Address Strobe 2
42	/CAS3	/CAS3	Column Address Strobe 3
43	/CAS1	/CAS1	Column Address Strobe 1
44	/RAS0	/RAS0	Row Address Strobe 0
45	/RAS1	/RAS1	Row Address Strobe 1
46	n/c	n/c	Not connected
47	/WE	/WE	Read/Write
48	n/c	n/c	Not connected
49	DQ9	DQ9	Data 9
50	DQ27	DQ27	Data 27
51	DQ10	DQ10	Data 10
52	DQ28	DQ28	Data 28
53	DQ11	DQ11	Data 11
54	DQ29	DQ29	Data 29
55	DQ12	DQ12	Data 12
56	DQ30	DQ30	Data 30
57	DQ13	DQ13	Data 13
58	DQ31	DQ31	Data 31
59	VCC	VCC	+5 VDC
60	DQ32	DQ32	Data 32
61	DQ14	DQ14	Data 14
62	DQ33	DQ33	Data 33
63	DQ15	DQ15	Data 15
64	DQ34	DQ34	Data 34
65	DQ16	DQ16	Data 16
66	n/c	n/c	Not connected
67	PD1	PD1	Presence Detect 1
68	PD2	PD2	Presence Detect 2
69	PD3	PD3	Presence Detect 3
70	PD4	PD4	Presence Detect 4
71	n/c	n/c	Not connected
72	VSS	VSS	Ground

Size:

Notes: A9 is a N/C on 256k and 512k modules.
A10 is a N/C on 256k, 512k, 1M and 4M modules.
RAS1/RAS3 are N/C on 256k, 1M and 4M modules.

Source: Various productsheets at IBM Memory Products

Please send any comments to Joakim Ögren.