Haha Zorro I goodness.
Rare, but useless.
The slots are electrically compatible with Zorro II, as was mentioned above, but of course they don't fit very well if you plug in a normal full length card.
Check the volts and grounds first with a multimeter, I seem to remember that the Zorro II cards have their end brackets facing the user when you plug them in.. Not 100% certain, so please check before plugging in anything.