# 30 pin SIMM

SIMM=Single Inline Memory Module.

(at the computer)

30 PIN SIMM at the computer.

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 | Something 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.
A9 is N/C on 256kB.
A10 is N/C on 256kB & 1MB. A11 is N/C on 256kB, 1MB & 4MB.

Contributor: Joakim Ögren, Helfried Behrendt

Source:
comp.sys.ibm.pc.hardware.* FAQ Part 4, maintained by Ralph Valentino

Copyright © The Hardware Book Team 1996-2001.
May be copied and redistributed, partially or in whole, as appropriate.
Document last modified: 2001-06-08