[Simh] Configuration limitations

[Rich Alderson]

> From: Johnny Billquist <bqt at 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.

                                                                Rich