[Coco] What do you make of this non-approved HSCREEN mode?

[James Hrubik]

Hmmm.  HSCREEN2 is only 320 pixels wide.  Line 30 says you are poking  
128 into the first 16 pixels of the hires screen.  Is T a counter?  I  
though perhaps the program was grabbing 400 as the decimal number of  
pixels in the row, so I changed it to 319, but it did not change the  
display.  Line 40 says you are poking 64 into pixels 17-20, then  
executing the T loop again.

What has me puzzled now is that line 40 seems to be executing before  
line 30, in that pixels 0-3 turn black, then there are 16 red ones,  
then another 4 black, etc.  After 16 black "dashes" are laid down in  
the top row, 4 light blue "dashes" get laid down in the second row  
SIMULTANEOUSLY with the last 4 dashes in the top row; the last 4  
dashes in the top row are also the same light blue instead of black.   
That is where the second row at the left side comes in being generated.

So I am seeing the program itself specify laying down 16 pixels of  
one color, followed by 4 pixels of a second color.  On screen,  
however, I see it lay down 4 pixels of one color followed by 16 of  
the second color, and possibly suffering some sort of line overflow  
before it gets to the end of the HSCREEN2 row.

Maybe more commenting of the listing would help solve this??  What  
did you want it to do??


On Jun 6, 2009, at Saturday, June 6, 2009 - 1:59 PM, Robert Gault wrote:

> James and Benoit,
>
> You will need to look very carefully at the screen. The FOR/NEXT  
> loops should set 16 pixels in the first loop and 4 pixels in the  
> second. Now look at both the right and left sides of the screen.
>
> Why is there a second row of 4 pixels set at the left side of the  
> screen?!
>
> ==============
> The colors seen will depend on whether a composite or RGB monitor  
> is being used. The actual colors don't matter and may need to be  
> changed for easier viewing.
>
> --
> Coco mailing list
> Coco at maltedmedia.com
> http://five.pairlist.net/mailman/listinfo/coco

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