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That might be useful in combination with the contents of any ROM chips on the boards - just a schematic doesn't necessarily help unless everything is implemented without any programmable memory chips at all.
Reversing anything is a lot of effort that can better be spent learning the design aspects. What I have found is after visiting the code of, say, a PCM70, LXP1, and DN780, you learn less and less from further reversing, and you work on bigger boxes that take longer and longer to figure out.
Sometimes archival reversal is interesting... for example the enterprising individuals that have built copies of the old Apollo guidance computer... running the original code.
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