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by satiated_grue 48 days ago
There was at least one non-identical ISA slot:

https://www.lo-tech.co.uk/wiki/IBM_Personal_Computer_XT_Syst... https://www.lo-tech.co.uk/understanding-pcxt-slot-8/

2 comments

I used to have a couple of IBM EduQuest machines. The majority of the ISA slots were wrong-handed.
IBM was always special. :-) Aren't they the ones who invented the MCA bus abomination that required a floppy disk to configure each card?
You may want to read up on the history of dip switches, jumpers, and plug and play a little bit more.