Why an EISA card won't fit into an ISA slot 1/2: the slot tab is longer
https://digipres.club/system/media_attachments/files/110/978/758/914/391/967/original/6615d99388a8cd71.jpg
Here's the one I ordered incorrectly. Adaptec AHA-1740. EISA. Spoiler - you can put an ISA card in an EISA slot, but you can't put an EISA card in an ISA slot.
See the second and third photos to see why that doesn't work...
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