IBM Aptiva 2142 - Manual (Page 53)

System Memory
Both Type A-1 and Type A-2 system boards support 168-Pin 60 ns, Gold,
SDRAM, 64 bit Dual Inline Memory Module, (DIMM).
Maximum memory supported by Type A-1 and Type A-2 system boards is
384 MB.
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