Den 2018-04-13 kl. 21:55, skrev Rich Alderson:
From: Johnny Billquist <b...@softjar.se>
Date: Fri, 13 Apr 2018 02:24:41 +0200
On 2018-04-12 23:49, Bob Supnik wrote:
Enforcing configuration restrictions (for example, no mixing of disks
and tapes on the same channel) is yet more work.
Uh... Which should not be done to start with. From a hardware point of
view it is perfectly legal to mix tapes and disks on the same massbus.
Most OSes did not support that, but RSX-11M-PLUS actually do. It's
called a mixed massbus.
Similarly for TOPS-20, although Tops-10 does have such a restriction.
Note that the Unix systems never had any problem with this. In fact, it was
quite common to mix in on VAXen running 4BSD (no reason to get an extra
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