Watford DFS and DDFS
--------------------

Watford DFS 1.4x is for the 8271 controller.
Watford DFS 1.5x is for the 1770 controller.

WDFS143   - Watford DFS for the 8271 floppy controller
WDFS144T  - Watford DFS for the 8271 floppy controller
WDDFS153  - Watford DDFS for the 1770 floppy controller
WDDFS154T - Watford DDFS for the 1770 floppy controller
WDDFS153M - Watford DDFS for the Master 128


Of the Watford DFSes, 1.x3 and 1.x4 are the best. 1.x3 has verbose error
messages but no Tube support, 1.x4 has Tube support but terse error
messages.

Both also auto-detect track density and automagically double-step an 80
track drive to read 40 track discs. With switches 3 and 4 set correctly
under the keyboard, this is a very fast and compatible DFS.

New in v1.43/v1.53
- Full TUBE compatibility
- Formatting now skews the sectors to produce a disc that works faster
- DFS commands can now be prefixed with an O
- DFS now retains information over a soft Break. Libraries, directories,
  WORK command, drive, OPT settings, file status, density and double
  stepping are all retained as long as DFS workspace is not corrupted.

- *HELP SPACE and *HELP FILES now work fully on Econet.
- *CAT which fully exploits screen width has been further improved.
- *FX commands for 40/80 switching have been replaced by two new *OPT
  commands.

The combination of a 1.x2 (or later) DFS with DNFS now eliminates the DFS
aspect of the DNFS. This means that *HELP will not show the DFS 1.20 and
PAGE will not be altered by the combination of DFS and DNFS together. The
TUBE and Econet aspects of DNFS are not affected.

DDFS 1.53/1.54 also has a new and effective 8271 emulation built in.

These DFSes will run the Acorn Level 2 Econet File server system.