psedo code for fill.asm

[inyeop]

initial thought is to use nested loop.  is that right?

for (row=0;row<255;row++)
  for(col=0;col<511;col++)
     SCREEN[32*row + col/16] = -1

[cadet1620]

The Screen is 256 x 512 pixels.

The Screen occupies memory addresses 16384..24757 inclusive, so there are 8192 words of memory in the screen. Therefore, each Screen word controls 16 pixels. (Details in 4.2.5.)

You don't need nested loops setting each pixel individually; it is sufficient to set each of the Screen words to all black or all white pixels.

--Mark

[inyeop]

Oh I think I got it.  I keep thinking in terms of 2 dimensional table.  Instead, it's sequential, 1 dimensional 8K memory locations.. haha.. thanks!!!