IBM Aptiva 2134, Hardware Maintenance Service

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System Memory
Both Type A-1 and Type A-2 system boards support 72-Pin, 60 or 70 NS,
tin-lead, fast page or EDO, 32 or 36 bit Single Inline Memory Module,
(SIMM).
Type A-2 can also accept a 168-Pin 60 NS, Gold, or EDO, 64 bit Dual Inline
Memory Module, (DIMM). See “SIMM Configurations—Type A-1” on
page 5-25 and “SIMM Configurations—Type A-2” on page 5-27 for
installation information.
SIMM Identification
72-pin memory SIMMs are usually marked with a label that shows the size
and speed (for example,
1Mx32, 6 ns
). To determine the SIMM capacity
from the above example, divide 32 bits by 8 bytes and multiply that answer
by 1M, hence, SIMM = 4 MB. 1Mx32 is Non parity and 1Mx36 is Parity.
SIMMs that are not clearly labeled cannot be identified other than by part
number. Consult the SIMM manufacturer documentation to identify SIMMs.
DIMM Identification
168-pin memory DIMMs can usually be identified by the information on the
chip modules. (for example,
2Mx64, 6 ns, EDO
). To determine the DIMM
capacity from the above example, divide 64 bits by 8 bytes and multiply that
answer by 2M, hence, DIMM = 16 MB. 1Mx32 is Non parity and 1Mx36 is
Parity. DIMMs that are not clearly labeled cannot be identified other than by
part number. Consult the DIMM manufacturer documentation to identify
DIMMs.
General Information
1-27