Macintosh IIsi: Logic Board ROM Slot is for Upgrades


Some Macintosh IIsi computers have a slot and a board next to the
NuBus/030 expansion slot. I can't find any information about the slot in
the manuals or recent magazines.

The ROM SIMM slot is for upgrading Macintosh IIsi ROMs. There are
actually two versions of the logic board being shipped as of December
1990: One type has the ROM surface-mounted to the logic board; the other
does not have this ROM at all (only a space for it) but does have the SIMM
installed.

The rule-of-thumb for the ROM SIMM: If a board has it, don't remove it;
if it doesn't, don't put one in.


Published Date: Feb 18, 2012