unix precursors

[Eric Fischer]

Paul West writes,

> BTW, there apparently were two different timesharing systems developed
> for the PDP-1, the second one coming from Bolt, Beranek, and Newman
> (BBN).

Thanks for reminding me about the Jack Dennis article -- I had
forgotten about that one.

There were, I think, at least *four* time-sharing systems for the
PDP-1.  Besides the MIT and BBN ones, there was also the Hospital
Computer Project (I'm not sure whether that one was descended from
the early BBN system or was written from scratch) and the THOR
system at Stanford.  I can't give proper citations because I'm
currently 2000 miles from my book collection.

eric

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