For some reason or other,
SIM type memory modules
have become more popular
than SIP types. The difference
between these is the way they
are inserted into the memory
expansion sockets on the PC
motherboard: a SIP module
has wire pins, while a SIM
module has contact fingers
etched on a printed circuit
board which carries the memory
ICs. Although in ftrst-generation
PC-ATs both types of
memory module can be used,
and, indeed, mixed freely, an
increasing number of PCs,
particularly the newer 386/ 486
machines, allow SIM modules
to be used only.
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