[Coco] Dos ROMS.

[Gene Heskett]

On Sunday 19 November 2006 11:27, Phill Harvey-Smith wrote:

>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

> ?

>

Humm, that addressing seems to be slightly fubar.  IIRC,
RS-DOS (Color Basic) lives at $8000-$9FFF.
Extended Color Basic lives at $A000-$BFFF I believe and
Disk Extended Basic lives at $C000-$DFFF.  Only for the coco3 does 
anything live at $E000 and above (that I know of anyway)


>Cheers.

>

>Phill.

>

>--

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

>

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


-- 
Cheers, Gene
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Copyright 2006 by Maurice Eugene Heskett, all rights reserved.