[BBC-Micro] TUBE code in the Master
dl.harper at btopenworld.com
Mon Mar 3 20:08:57 GMT 2008
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. They just had to find somewhere to put it, and there wasn't room
in the original Model A/B MOS ROM. (It wouldn't work with the earliest OS
It seems to have been assumed that no-one would want to use the Tube without
a disk or network filing system installed as well, so the Tube host code was
included with these filing system ROMs. (It never was included with ADFS, as
far as I recall - again lack of space. Even if you want to use ADFS as your
only filing system on a Model B, you still have to have one of the other FS
ROMs in the machine if you want to use the Tube.)
There is other stuff in the same ROM bank as DFS (bank 9), in particular the
Sideways RAM utilities (SRLOAD, etc.), but not the Tube code.
If you *UNPLUG F, then you will find you cannot use the Tube. On the other
hand, *UNPLUG 9 will not affect the Tube, though it will disable DFS and the
Sideways RAM commands.
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