Pinouts >  Memory slots and cards connectors
30 pin SIMM connector layout
30 pin SIMM connector
at the computer
SIMM=Single Inline Memory Module
Pin Name Description
1 VCC +5 VDC
2 /CAS Column Address Strobe
3 DQ0 Data 0
4 A0 Address 0
5 A1 Address 1
6 DQ1 Data 1
7 A2 Address 2
8 A3 Address 3
9 GND Ground
10 DQ2 Data 2
11 A4 Address 4
12 A5 Address 5
13 DQ3 Data 3
14 A6 Address 6
15 A7 Address 7
16 DQ4 Data 4
17 A8 Address 8
18 A9 Address 9
19 A10 Address 10
20 DQ5 Data 5
21 /WE Write Enable
22 GND Ground
23 DQ6 Data 6
24 A11 Address 11
25 DQ7 Data 7
26 QP Data Parity Out
27 /RAS Row Address Strobe
28 /CASP CAS Parity
29 DP Data Parity In
30 VCC +5 VDC
Note: SIMM above is a 4MBx9.

QP & DP is N/C on SIMMs without parity.
Pins A9 through A11 are N/C, except as follows.
A9 is used for 1M and bigger,
A10 is used for 4M and bigger
A11 is used for 16M
Pinout status: +4 -0
According to 5 reports in our database (4 positive and 0 negative) the SIMM 16Mb (30 pin) pinout should be correct.

Is this pinout
NO DIY devices
SIMM 16Mb (30 pin) visual pinout:click to enlarge
Source(s) of this and additional information: comp.sys.ibm.pc.hardware.* FAQ Part 4, maintained by Ralph Valentino, from J. Ogren and Helfried Behre, comp.sys.ibm.pc.hardware.* FAQ Part 4, maintained by Ralph Valentino
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