[30-pin SIMM] [72-pin SIMM] [72-pin SODIMM] [72-pin ECC SIMM]
[Memory Module Signal Assignments]
Computer Memory Module sticks using the 30-Pin SIMM format are listed on
this page. A 30 pin memory card has 30 pins [or fingers] on each side of
the memory module board; how ever, the pins on either side of the PWB are
connected together. The memory module may appear to have 60 pins when in
fact there are only 30 unique signal pins. 30 pin SIMMs used only an
8-bit data bus perhaps 9-bits using ECC. In this case ECC may also be
At last check 30-pin SIMMs had an access time of 60nS, which is very slow by today's standards. The Pin Out and Signal names for a 30-Pin SIMM module is listed below.
30 pin SIMM modules are obsolete, replaced by 72-pin SIMMS, and no longer used.
In fact 72-pin SIMMs are obsolete, as SIMM modules were later replaced by DIMM memory modules.
Pinouts of memory modules using the 72 pin format may be found on the PC Memory Modules page.
Refer to the Computer Memory Modules page for additional pinouts and memory module descriptions, memory module types, memory terms and current memory standards.
|Pin #||Signal name||Signal Description|
|2||/CAS||Column Address Strobe|
|26||QP||Data Parity Out|
|27||/RAS||Row Address Strobe|
|29||DP||Data Parity In|
Note: QP and DP is N/C on SIMMs without parity.
A9 is N/C on 256kB.
A10 is N/C on 256kB and 1MB. A11 is N/C on 256kB, 1MB and 4MB sticks
Data width is 8 bits per memory stick [the front 30 pins and back 30 fingers on the card are connected together]
SIMM: Single Inline Memory Module
DRAM: Dynamic Random Access Memory
FPM: Fast Page Mode: (asynchronous) Obsolete, faster than normal DRAM, used in 386/486 computers. All 30 pin SIMMs use FPM memory.
30 pin SIMMs have an alignment notch on the bottom left to side. 30 pin SIMM modules are obsolete and no longer used.
For electronic device manufacturers see one of these pages:
Back to the main Computer Memory Modules information page. Memory IC manufacturers
Memory Module manufacturers
Additional electronic Equipment manufacturers may be found by selecting the OEM Equipment icon below.
Component manufacturers may be found by selecting the Components icon below.
Also refer to a list of Companies that manufacture Components, listed in order.
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