Created this because I've been in Wales for a bit and realised that OS4 lacked support.
This is only part of the puzzle - ISO-8859-14 seems poorly supported in OS4.

Topaz/8 needs an ISO-8859-14 version, otherwise OS4 tends to default to using
ISO-8859-1 which lacks W-circumflex (Ð) and some other characters.  Properly written
programs with a Welsh catalog in the correct charset should still display correctly
however.

The other issue is keymap - I've created a modified keymap which has the
circumflex characters on Alt-W etc, as well as via DeadCircumflex (Alt-H).
Alt-D is DeadDotAbove which is useful for the other ISO-8859-14 characters but
probably not much use for Welsh language typing.

Note that the Deja Vu font doesn't have all of the DotAbove characters anyway.

INSTALLATION
------------
Copy the locale and devs directories to the root of SYS:
(alternatively, copy the contents to the respective directories in SYS:)

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 PERMSSN    UID  GID    PACKED    SIZE  RATIO METHOD CRC     STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                 5263    6206  84.8% -lh5- 3a9f Dec 16 01:13 welsh.info
[generic]                 1982    5307  37.3% -lh5- 81a9 Dec 16 01:02 welsh/devs/keymaps/gb_cymraeg_ISO-8859-14
[generic]                 2296    4616  49.7% -lh5- 7f79 Dec 16 00:17 welsh/locale/languages/welsh_ISO-8859-14.language
[generic]                  646    1157  55.8% -lh5- f88b Dec 16 01:13 welsh/welsh.readme
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         4 files   10187   17286  58.9%            Dec 15 17:54