87. Acorn DFS page setting
    ~~~~~~~~~~~~~~~~~~~~~~
The normal setting of PAGE with the Acorn DFS 0.90 and 1.20, (DNFS), is
&1900. It is possible to set it at a lower value, in order to gain valuable
memory space, but only at a price. Here is a list of the possible PAGE
values, together with a note of the facilities available. The limitation
revolves around the number of files which can be simultaneously open, and
whether you can use *SPOOL and *EXEC, which is a type of file. Note that
LOAD/SAVE also refers to all the similar commands CHAIN, *LOAD, *RUN etc..

It is interesting to note that a PAGE value of &1700 would appear to be just
a good as &1900, and that &1100 is just as good as &1200. &1100 is the
absolute minimum value possible without nasty things happening if you access
the disc drive(s), even just to do a *CAT. For those of you who are
interested in making use of the information contained in the disc workspace,
details were given in tip #71.

In order to get most of the information into the workspace, the disc must
have been accessed at least once; just a *CAT will do. If you don't actually
want the catalogue to come up on the screen, then precede the *CAT with
VDU21, and follow it with VDU6 on the next line. This will temporarily
inhibit the screen.

        PAGE VALUE    FACILITIES

         &1900        5 Files + LOAD/SAVE + SPOOL/EXEC
          1800        5 Files + LOAD/SAVE + SPOOL/EXEC
          1700        5 Files + LOAD/SAVE + SPOOL/EXEC
          1600        4 Files + LOAD/SAVE + SPOOL/EXEC
          1500        3 Files + LOAD/SAVE + SPOOL/EXEC
          1400        2 Files + LOAD/SAVE + SPOOL/EXEC
          1300        1 File  + LOAD/SAVE + SPOOL/EXEC
          1200        0 Files + LOAD/SAVE
          1100        0 Files + LOAD/SAVE
less than 1100        No disc operations possible