[Coco] I now have working CoCo 1-2 HDB-DOS 16K ROM

[Juan Castro]

...with my spiffy text-on-graphics mode already resident. All you have
to do is type SCREEN 1 after boot. (I set the default PMODE to 4.)

EXEC &HE005 -> 64 cols mode
EXEC &HE002 -> 51 cols mode

And I didn't have to squash any messages. All I needed was to change
the placement of a subroutine so I could change some JSR into BSR and
I got the three bytes I needed.

Source patch against current repository version:
https://dl.dropboxusercontent.com/u/15643089/hdbdos-16krom.patch

ROMs: (You can use the Becker one with DW for XRoar)
https://dl.dropboxusercontent.com/u/15643089/16kroms.zip

Nice for those CoCoEPROMPacks!

Juan