[Coco] NitrOS9 L2 CoCo 3 question: Display settings/modifications

Robert Gault robert.gault at att.net
Tue Jun 14 09:32:53 EDT 2016

Rogelio Perea wrote:
> On my Tandy stock OS9 L2 I patched the TERM to allow the CoCo 3 boot into
> 80 columns white text on black background.
> As much as I love the nuclear green on the computer I would like to set
> NitrOS9 the same way: boot into a white text on black background (and
> border) 80x24 screen... I know the display settings can be modified after
> the boot process is done, leaving that as a last resort.
> I have the patch file for my stock setup in a disk at home... got some
> downtime at work with VCC on my laptop. Even if I had the patches with me I
> doubt they would work on NitrOS9 with all the changes compared to the stock
> Tandy release of OS9.
> Any hints greatly appreciated.
> -- RP


The easiest way to change the colors on the screens is to use Xmode. If all you 
want to change is /term and don't care about the boot screen, after booting enter
xmode /term
You will see the values for fgc, bgc, and bdc. You will want to change those. 
For a 24 line screen, you will also want to check pag.

The values I have for a white screen with black letters 80x24 are:

xmode /term pag=18 fgc=2 bgc=0 bdc=0
Now you want to make those changes permanent so ex.
cobbler /D0

If you have a hard drive, cobbler may not work for you so you can edit OS9Boot 
with ded to make changes to OS9Boot.


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