Date   : Mon, 03 Mar 2008 20:41:56 +0000 (GMT)
From   : info@... (Sprow)
Subject: TUBE code in the Master

In article <002f01c87d6a$69ef1260$4101a8c0@...>,
   David Harper <dl.harper@...> wrote:
> Pete Turnbull wrote:
>
> > I was sure it's in the 1770DFS part.  On a Model B, it's in the DNFS ROM
> > or 1770DFS, and in some mid-life versions of the NFS ROM.  On a Master,
> > it's only in the 1770DFS, AFAIK.
>
> No, it isn't. It's with "Terminal" in ROM bank &F (see my earlier message).
>
> There is no particular reason why it should be associated with a filing 
> system ROM.
>
> If you *UNPLUG F, then you will find you cannot use the Tube. 

Yes you can.

Unplugging the respective filing system on a B/B+ stops the Tube from
working because there's noone listening for the service call which prompts
the Tube initialisation.

On the Master unplugging Terminal has no effect as the code for *FX143
always calls ROM 15 regardless of its status: the bulk of the Terminal
service code is mainly used for the Tube and some cassette filing system
stuff.

The code for *FX142 does obey the unplugged status so you can't enter
Terminal,
Sprow.