[Coco] Forground / Background

[coco at jechar.ca]

This info must somehow be insufficient as I am getting
results that do not make sense, For the time being
I will just look at forcing a palette rather then
using the existing one not so polite for other programs
but I am getting impatient to get on to the next phase
of this project.


On 2019-09-02 18:40, Wayne Campbell wrote:
> I always use a BYTE variable I name call or callcode to hold the system
> call number. It is handy for two reasons. First, $8D will be stored as 
> an
> integer. Since the value is in the range of a byte, using a BYTE 
> variable
> to hold it will save one byte. Second, if you have to use more than one
> system call in your procedure, it's easier to copy and paste RUN
> SysCall(call,regs) and just make sure call is set to the appropriate 
> system
> call code.
> 
> 
> On Mon, Sep 2, 2019, 1:09 PM <coco at jechar.ca> wrote:
> 
>> OK based on what you told me and a previous related example.
>> 
>> I came up with:
>> 
>> PROCEDURE fbb
>> TYPE registers=cc,a,b,dp:BYTE;x,y,u:INTEGER
>> DIM regs:registers
>> DIM i:INTEGER
>> PARAM fbbstatus(3):BYTE
>> 
>> (* Standard output path we are using *)
>> regs.a=1
>> (* SS.Palet GetStat call # *)
>> regs.b=$96
>> (* Point to place to hold all 16 current palette register settings *)
>> regs.x=ADDR(fbbstatus)
>> RUN syscall($8d,regs)
>> END
>> 
>> The only thing I am not sure of is RUN syscall($8d,regs)
>> I am not sure what the $8d means and if it is correct
>> in this case it is just taken from a different example
>> maybe it does not apply here?
>> 
>> 
>> 
>> On 2019-09-02 14:46, L. Curtis Boyle wrote:
>> > 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
>> >>>> --
>> >>>> Coco mailing list
>> >>>> Coco at maltedmedia.com
>> >>>> https://pairlist5.pair.net/mailman/listinfo/coco
>> >>
>> 
>> --
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>>