[Coco] Thexder RGB vs Composite Mode.

[Mark Ormond]

Actually, what I meant is the cart is never selecting the composite colors. It always is selecting RGB regardless if I am holding clear when I power on or not.

-----Original Message-----
From: coco-bounces at maltedmedia.com [mailto:coco-bounces at maltedmedia.com] On Behalf Of Robert Hermanek
Sent: Wednesday, December 21, 2011 12:30 PM
To: CoCoList for Color Computer Enthusiasts
Subject: Re: [Coco] Thexder RGB vs Composite Mode.

Don't know if it would help, but the attached file contains 3 columns, made this for one of my PC projects:

Column 1 is the hex color a PC would use Column 2 is the color computer CMP code (0-63) Column 3 is the color computer RGB code (0-63)

So could you take the RGB color table in the cart and convert it to proper CMP values using this table, then make & burn a fixed EPROM?

----- Original Message -----
From: "Robert Gault" <robert.gault at att.net>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Wednesday, December 21, 2011 11:19 AM
Subject: Re: [Coco] Thexder RGB vs Composite Mode.


> OK, the "bug" if you want to call it that is a table of equivalent color 
> values stored in the ROM at $C1F7-$C216. The first half are the RGB colors 
> and the second half the CMP.
> Since the CMP colors are not correct, I'd bet that they were taken from a 
> reference without testing. The only way to correct the problem would be to 
> burn a new EPROM with a better color equivalency table.
>
> Creating a better table is easy but time consuming. You need to use MESS 
> which can flip at will between CMP and RGB colors. Write a program that 
> changes palette colors on command and try to match CMP and RGB colors.
> Specifically for each RGB entry in the Thexder color table, find a 
> matching CMP color. With a revised color table, you could play the game in 
> MESS with a patched ROM image if you can't burn an EPROM.
>
> You should be aware that you can't match perfectly CMP and RGB colors. 
> However you ought to be able to get closer than those used in Thexder.
>
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