EduQuest Option Cards
There are some special option cards for use in the EduQuest systems. While they are in fact normal ISA cards, the component side and connectors on the card are flipped from their normal orientation to fit special "EduQuest slots" in the EduQuest machines. The EduQuest machines that supported these cards also had standard ISA connectors for use with conventional ISA expansion cards.
I'm sure there are more of these around, but all I have run into so far is the EduQuest sound card and the Token Ring network interface card.
The following pages cover these cards and any related components in more detail: