[atari7800] Re: 320 modes

  • From: <bob.montgomery@xxxxxxxxxxx>
  • To: <atari7800@xxxxxxxxxxxxx>
  • Date: Thu, 10 Apr 2008 09:20:42 -0600

Hi Eric,

>Each 160 pixel is 5 bits of line RAM.  The 320 modes only change how
>bits are read, not written.  So unless all 5 bits are zero (and
>mode off), then all bits are changed to the new value.  If kangaroo
mode is 
>on, then all 5 bits are always changed and any color 0 pixels are
>as the background color.

Thanks; I had to read that a few times to understand it, and understand
how that answered my question - but I think I got it. ;)

But one thing: of the 32 values (5 bits), aren't several of them
transparent?  Aren't all of the following transparent: %00000, %00100,
%01000, %01100, %100000, %10100, %11000, %11100



Other related posts: