If you or your dealer are purchasing a SIMM from a source
other than PARAVISION, INC., you must be certain to get the
correct type. M1230 XA does NOT use the common, 8-bit
SIMM as found in the Macintosh marketplace. Rather it
uses the same sort of SIMM as used in the Amiga 4000.
This is a 72-pin, 32-bit wide SIMM. M1230 XA needs at
least a 100ns SIMM. You can use a 80ns, 70ns, 60ns, or
even 40ns SIMM but these may cost more. The following is
a list of Micron part numbers for the correct SIMM. You can
use the equivalent parts from any good quality manufacturer.
M1230 XA SIMM SPECIFICATION (example only): 80ns, 72-
pin “wide-body” SIMM organized N-megabytes x 32 bits. For
example, Micron MT8D25632 (one megabyte);
MT16D51232 (two megabytes); MT8D132 (four megabytes);
and MT16D232 (eight megabytes).
http://www.oempcworld.com/OEMPCworld-com/32MPG.htmlhttp://www.oempcworld.com/OEMPCworld-com/128M.html