[Coco] Dos ROMS.

[Phill Harvey-Smith]

Hi,

I'm just implementing multiple DOS rom support in Mess, I have it 
working correctly for the Dragon, so that now you can select which of 
the following dos roms you want to use : DragonDos 1.0, SuperDos E6, 
Cumana Dos, Eurohard DragonDos 4.0 or DosPlus, you can also elect to 
have no dos rom loaded, so that the machine may be booted as cassette only.

I would like to implement the same for the CoCo, and have a couple of 
questions.

1) I know there was a 1.0 version of RS-DOS, and that Mess uses RS-DOS 
1.1, is the 1.0 rom available anywhere ?

2) Where there other doses, available also that where compatible with 
the standard RS-DOS cart ?

3) The mess driver for the CoCo3 seems to load the RS-DOS rom twice, 
once at the normal $C000 and also at $E000, is there any special reason 
for this, or is it just down to the address decoding in the RS-DOS cart ?

Cheers.

Phill.

-- 
Phill Harvey-Smith, Programmer, Hardware hacker, and general eccentric !

"You can twist perceptions, but reality won't budge" -- Rush.