IBM 2140, 2142 manual System Memory, Dimm Identification

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 Information1-27