72 pin ECC SIMM Pinout

[30-pin SIMM] [72-pin SIMM] [72-pin SODIMM] [72-pin ECC SIMM]
[Memory Module Signal Assignments]

72-Pin Memory Module Signal Assignments

72 pin SIMM modules are obsolete and no longer used. SIMM modules were replaced by DIMM memory modules.
The pinout for 72 pin SIMM memory is listed in the table below.

Refer to the main Memory Module manufacturers page for an updated list of current PC memory modules in production.

SIMM memory sticks are no longer being produced, and can not be purchased as new products.

**72-pin SIMM Memory Module**
Pin #	ECC	Optimized	Signal Description
1	VSS	VSS	Ground
2	DQ0	DQ0	Data 0
3	DQ1	DQ1	Data 1
4	DQ2	DQ2	Data 2
5	DQ3	DQ3	Data 3
6	DQ4	DQ4	Data 4
7	DQ5	DQ5	Data 5
8	DQ6	DQ6	Data 6
9	DQ7	DQ7	Data 7
10	VCC	VCC	+5 VDC
11	PD5	PD5	Presence Detect 5
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	n/c	n/c	Not connected
20	DQ8	DQ8	Data 8
21	DQ9	DQ9	Data 9
22	DQ10	DQ10	Data 10
23	DQ11	DQ11	Data 11
24	DQ12	DQ12	Data 12
25	DQ13	DQ13	Data 13
26	DQ14	DQ14	Data 14
27	DQ15	DQ15	Data 15
28	A7	A7	Address 7
29	DQ16	DQ16	Data 16
30	VCC	VCC	+5 VDC
31	A8	A8	Address 8
32	A9	A9	Address 9
33	n/c	n/c	Not connected
34	/RAS1	/RAS1	Row Address Strobe 1
35	DQ17	DQ17	Data 17
36	DQ18	DQ18	Data 18
37	DQ19	DQ19	Data 19
38	DQ20	DQ20	Data 20
39	VSS	VSS	Ground
40	/CAS0	/CAS0	Column Address Strobe 0
41	A10	A10	Address 10
42	A11	A11	Address 11
43	/CAS1	/CAS1	Column Address Strobe 1
44	/RAS0	/RAS0	Row Address Strobe 0
45	/RAS1	/RAS1	Row Address Strobe 1
46	DQ21	DQ21	Data 21
47	/WE	/WE	Read/Write
48	/ECC	/ECC
49	DQ22	DQ22	Data 22
50	DQ23	DQ23	Data 23
51	DQ24	DQ24	Data 24
52	DQ25	DQ25	Data 25
53	DQ26	DQ26	Data 26
54	DQ27	DQ27	Data 27
55	DQ28	DQ28	Data 28
56	DQ29	DQ29	Data 29
57	DQ30	DQ30	Data 30
58	DQ31	DQ31	Data 31
59	VCC	VCC	+5 VDC
60	DQ32	DQ32	Data 32
61	DQ33	DQ33	Data 33
62	DQ34	DQ34	Data 34
63	DQ35	DQ35	Data 35
64	n/c	DQ36	Data 36
65	n/c	DQ37	Data 37
66	n/c	DQ38	Data 38
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	DQ39	Data 39
72	VSS	VSS	Ground

Data width is 32 bits per memory stick [the front 72 pins and back 72 fingers on the card are connected together]

The approximate board size. 4.25" x 1.0"

SIMM: Single Inline Memory Module
DRAM: Dynamic Random Access Memory
ECC: Error Correcting Code
FPM:Fast Page Mode: (asynchronous) Obsolete, faster than normal DRAM, used in 386/486 computers.
EDO: Extended Data Out: (asynchronous) A superset of FPM, just faster than FPM.
All 72 pin SIMMs use either EDO or FPM memory. 72 pin SIMM modules are obsolete and no longer used.
72 pin SIMMs have an alignment notch on the bottom left to side, and a notch in the center. Additional 72 pin modules pinouts include:
72 pin SIMM pin outs, or 72 pin SO DIMM pin out. Additional pinouts may be located on the Memory Module manufacturers page.

The 72-pin SIMM table details an obsolete SIMM memory stick that is no longer in production.
SIMM memory is out-dated, out of production and should be replaced as soon as the Mother-Board is upgraded.

Back to the main Computer Memory Modules information page. For electronic device manufacturers see one of these pages:
Memory IC manufacturers, or Memory Module manufacturers
Additional electronic Equipment manufacturers may be found by selecting the OEM Equipment icon below, or component manufacturers may be found by selecting the Components icon below.

Also refer to an alphabetic listing of Companies that manufacture Components, listed in order.

Navigation: Engineering Home > OEM Equipment Vendors > Computer Gear > Memory Modules > Memory Module Pinout > 72 pin SIMM with ECC.


Home


Distributors	Components	Equipment	Software	Standards	Buses	Design	Reference