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From: jnc@mercury.lcs.mit.edu (Noel Chiappa)
Subject: Re: [TUHS] vi in v7
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    > From: Dave Horsfall

    > Weren't V5/6/7/etc distributed as bootable tapes?  Set the switch register 
    > to point to the tape instead of the disk...

Yes. See here:

  https://gunkies.org/wiki/Installing_UNIX_Sixth_Edition
  https://gunkies.org/wiki/Installing_Unix_Seventh_Edition

for the details of how it works.

    Noel