> On Nov 7, 2017, at 8:01 PM, Johnny Billquist <b...@softjar.se> wrote:
>
> On 2017-11-08 01:54, Paul Koning wrote:
>> ...RSTS definitely did not. It does support mixed RP/RM massbus, which is
>> more usual but not universal either, I think. But no mixing disk and tape.
>
> Thanks. I was wondering about RSTS/E, but didn't dare saying something
> definitive. That it allows mixing of RM/RP is nice. I think in plain -11M,
> even that might not be allowed, but I would have to go and check and refresh
> my memory.
> M+ allows any kind of combinations.
It's possible that the first Massbus support in RSTS didn't allow mixing RP and
RM, but it certainly appeared soon after, I'm pretty sure by V7.0 at the
latest. So as of that point, RSTS supported two Massbus adapters for disks,
and each of these could have any Massbus disk on it. Even an RP07, on an 11/70
at least, though officially that was not supported (DEC didn't sell that device
on lowly PDP-11s).
paul
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