I have several (3) Quadra 840AVs. Today I noticed that one of them has
a slot at J24 (I think) on the motherboard, next to the four SIMM
slots. This slot is occupied by what appears to be a small RAM stick,
which has printed on it "2MB SIMM APPLE COMPUTER". What is this, and
why do the other two machines not have it? I'll add that this machine
has a CDROM drive while the others do not, if that's significant. 

Thanks,

Jeffrey Ohlmann

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