🚀 go-pugleaf

  If this isn't the right place for this, cope.


  I am currently going nuts trying to write routines that will work in/with
the 360x480x256 video mode shown in example by John Bridges in his VGAKIT41
listings available at finer archives anywhere.  He refers to this mode 
as mode X, but I note that it is different from the Mode X described by
Michael abrash in his code from DDJ.  The code (routines that write directly
to the video hardware, mostly) to enter into both of these modes appears
quite similar.  On to my problem: I have written routines in TC2.0(not c++)
and MASM to set the 360x480 mode, and also to plot pixels on the screen
in this mode.  I think I'm setting the mode correctly, as the screen clears
without snow or flashes in the same manner it does when I set standard mode
13h, but If I try to set the palette using interrupt 10h, I get a nasty flash
on the screen.  Attempting to draw pixels by calculating the memory location
((yposition * xwidth)+(xposition/4)) (Side note: In Bridges' code, xwidth is
commented as having the value of 360, and in a different section, is set to
90 and 80.  Anybody know the correct value?) and outputting the bitplane 
mask to the sequencer appears to do nothing.

   I would like to use this mode for a few programs, but I can't seem to get
it right.  This mode would be better than the 320x240 mode, as I don't 
need to use animation or more than 1 video page.

  For reference, my video card is a no-name 256k model with a Paradise 
chipset(PVGA1A, I think).  I'm working on a 80386-25DX with TC2.0 and
MASM 4.0.

Any Ideas, people?  I've worked on this for about 6 hours, myself %-(

Thanks for any help,
Erik

--
Erik "Longshot" Green    
longshot@(vax1 | att2.cs | krypton | theory.cs).mankato.msus.edu  
     "Ash nazg durbatuluk, ash nazg gimbatul, ash nazg
       thrakatuluk agh burzum-ishi krimpatul!"