[Coco] 2 questions:: DECB and Nitros09 questions

[jdaggett at gate.net]

David

If you are using a Coco3 and  have the original Coco3 rom still 
installed on the main board, then returning to Disk Extended Color 
Basic (DECB) is simply done by removing the ROM is the disk 
controller card and placing the DECB1.1 rom in. 

There are so mods that will allow both to reside in the controller but 
some means of  physically switching the two is needed. To ch ange 
between them the Coco3 must undergo a power on reset or cold 
start to properly switch between them.
 
To boot and/or load from disk is a bit a rewrite of the DECB. Even 
though it could stand a rewrite. It would be nice to have a small boot 
code that powers  up the machine and acts as a bios. Then loads 
the basic in from either ROM or Disk depending if the disk is 
present. On a cold start or power on restart, the color basic checks 
to see if the Extended color basic rom is installed. Then checks to 
see if the DECB rom is installed. This is a hold over fromteh Coco 1 
days. This allows adding roms without rewrites of the previous 
roms. All three are copied into ram and patched and executed from 
ram on the Coco3. 


james


On 27 Mar 2005 at 17:09, David wrote:

Date sent:      	Sun, 27 Mar 2005 17:09:56 +1000
From:           	David <golgotha at toughguy.net>
To:             	CoCoList for Color Computer Enthusiasts 
<coco at maltedmedia.com>
Subject:        	[Coco] 2 questions:: DECB  and Nitros09 
questions
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> This may sound strange, but.. is there a way to boot Disk Extended
> Color Basic or some other Basic-based OS from a floppy? My floppy
> controller has a non-standard version of ADOS on-board, and I think
> it's behind troubles I'm having with some software..