The stock system came with an 8080 card which a lot of owners upgraded to the faster and more useful Z80 processor.
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The above show the 8080 card original to the IMSAI and two versions of the Z80 processor cards sold by CCS.
Dinosaur Attic is a non-smoking environment, so there is no “Joe Camel” effect on electronics (or anything else) where they smell like an ashtray, but after a quick clean-up with a mostly damp cloth and some alcohol cleaner they are ready for display.