[Coco] Ghana Bwana on my Coco3 not working but ok on Coco2

[Ghislain Harvey]

Hi Robert.
Excuse My ignorance but how do you change the two bytes o the game disk At
Track-34 Sector-4?
Thank for your time and for the information
Ghislain Harvey

-----Message d'origine-----
De : coco-bounces at maltedmedia.com [mailto:coco-bounces at maltedmedia.com] De
la part de Robert Gault
Envoyé : January-04-08 7:21 PM
À : CoCoList for Color Computer Enthusiasts
Objet : Re: [Coco] Ghana Bwana on my Coco3 not working but ok on Coco2

Steve Bjork wrote:
> There is a patch that I wrote a long time ago to make Ghana Bwana (and 
> other games) work on a CoCo 3.  (But don't have a copy of it.)
 ><snip>

Thanks Steve. I've looked at the code in the May '91 Rainbow and will 
summarize the relevant info here as the entire program patch is not 
needed essentially duplicating *.BAS , the boot program on the disk.

For others, the patch does not remove copy protection so you must have 
the original game disk. All the patch does is change two LOAD addresses 
and change some Coco3 palette values.

You need to change two bytes of the game disk Track-34 Sector-4. The 
bytes are $6A and $7A currently $FF and must be changed to $FE. Then the 
game will run on a Coco3.

If you have an RGB monitor, the game will be in black and white unless 
you change the Coco3 palette colors. That will give you a fake artifact 
color scheme but not as good as true artifact colors. So,
PALETTE 0,63
PALETTE 1,0
PALETTE 2,9
PALETTE 3,36
PALETTE 4,63
PALETTE 5,63
PALETTE 6,36
PALETTE 7,9
PALETTE 8,0
PALETTE 9,0
PALETTE 10,9
PALETTE 11,36
PALETTE 12,63
PALETTE 13,63
PALETTE 14,36
PALETTE 15,0
PALETTE 16,0

And in case it is not obvious, you are setting the color values white, 
black, blue, and red for RGB systems.

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