Den 2018-04-13 kl. 21:55, skrev Rich Alderson:
From: Johnny Billquist <>
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
massbus adapter).

-- Ragge
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