From Newsgroup: comp.arch
It was mentioned that the Electro-Data 205 was the first commercial
machine to have an index register, and someone noted he wasn't familiar
with that machine.
Well, it was later known as the Burroughs 205, and even if one hasn't
heard of it, one has probably _seen_ it. This page is a guide to where:
https://starringthecomputer.com/computer.php?c=45
John Savard
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