[Coco] Forground / Background

[L. Curtis Boyle]

As I mentioned, 2 color modes use palette #’s 0 to1, all 4 color modes use palette #’s 0 to 3, and the 16 color modes use palette #’s 0 to 15 (If I remember correctly, you can specify palette numbers 0 to 15 in every mode, but they just wrap over if you are in a mode with less colors (ie in a 4 color mode, palette 0-3, 4-7, 8-11, 12-15 are all the same thing).
As for getting your current foreground, background (and border) colors, use the SS.FBRgs GetStat system call (call #$96).

L. Curtis Boyle
curtisboyle at sasktel.net

TRS-80 Color Computer Games website
http://www.lcurtisboyle.com/nitros9/coco_game_list.html



> On Sep 2, 2019, at 12:36 PM, coco at jechar.ca wrote:
> 
> 
> OK and How does one know which registers are available in a particular
> graphics mode and which registers are currently being used for foreground
> and background ?
> 
> 
> On 2019-09-02 13:05, L. Curtis Boyle wrote:
>> It is always the lowest palette numbers used for lower color
>> resolution modes (2 color mode uses palettes 0-1, 4 color mode uses
>> palettes 0-3).
>> Sent from my iPhone
>>> On Sep 2, 2019, at 10:12 AM, coco at jechar.ca wrote:
>>> A bit more background the previous question is for OS-9 and Basic09.
>>> On 2019-09-02 12:08, coco at jechar.ca wrote:
>>>> There are 16 Palette registers, bot some modes do not use all 16
>>>> How does one know which registers are available in a particular
>>>> graphics mode and which registers are currently being used for forground
>>>> and background ?
>>>> Charlie
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>