54273



     Use normal playfield                             2
     Use wide playfield                               3
     Enable missile DMA                               4
     Enable player DMA                                8
     Enable both player and missile DMA              12
     Single line player resolution                   16
     Enable DMA Fetch instructions                   32

     Double line resolution is the default status. Use this register in
     conjunction with GRACTL at 53277 ($D01D). Both must be set
     properly or no display will result. BIT 5 enables DMA to fetch the
     display list instructions. If BIT 5 is not set (BIT 5 equals zero),
     ANTIC will not work. DMACTL is initialized to 34 ($22).
     A player in single line resolution might look like this:

     00011000                ##
     00111100               ####
     01111110              ######
     11111111             ########
     11111111             ########
     01111110              ######
     00111100               ####
     00011000                ##

     so that each byte is displayed on one TV line. The same player in
     double line resolution would look like this:

     00011000                ##
     00011000                ##
     00111100               ####
     00111100               ####
     01111110              ######
     01111110              ######
     11111111             ########
     11111111             ########
     11111111             ########
     11111111             ########
     01111110              ######
     01111110              ######
     00111100               ####
     00111100               ####
     00011000                ##
     00011000                ##

     where every byte is displayed over two TV lines.

54273          D401           CHACTL
     (W) Character mode control. See shadow register 755 for values
     that can be POKEd in. Only the least three bits (decimal zero to