> I'm going to go out on a limb and hypothesize that I have a 3.3V card 
> and it won't fit in a 1.5V slot... From these diagrams, that appears to 
> be the case. (There's another key not shown, but the board has no 
> contacts on it, and the slot appears to be mechanical only.)

A photo would help.  If it's really old it might be ISA :-)

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