704



-56, and the GTIA Demo Disk from APX.

704            2C0            PCOLR0
     Color of player 0 and missile 0. Locations 704 to 707 are also
     called COLPM# in some sources. This is the shadow for 53266
     ($D012). In GTIA mode ten, 704 holds the background color
     (BAK; normally held by 712). You cannot use the SETCOLOR
     commands to change the PCOLR registers; color values must be
     POKEd into them.

705            2C1            PCOLR1
     Color of player and missile 1. Shadow for 53267 ($D013).

706            2C2            PCOLR2
     Color of player and missile 2. Shadow for 53268 ($D014).

707            2C3            PCOLR3
     Color of player and missile 3. When the four missiles are
     combined to make a fifth player, it takes on the color in location
     711 (COLOR3). Shadow for 53269 ($D015).

708            2C4            COLOR0
     Color register zero, color of playfield zero, controlled by the
     BASIC SETCOLOR0 command. In GRAPHICS 1 and
     GRAPHICS 2, this color is used for the uppercase letters.
     Shadow for 53270 ($D016). You can change the values in all of
     the COLOR registers from BASIC by using either the
     SETCOLOR command or a POKE.

709            2C5            COLOR1
     The next four locations are the same as location 708 for the
     different playfields and SETCOLOB commands. In GR.1 and
     GR.2, this register stores the color for lowercase letters.
     COLOR1 is also used to store the luminance value of the color
     used in GR.0 and GR.8. Shadow for 53271 ($D017).

710            2C6            COLOR2
     The same as above for playfield two; in GR.1 and GR.2, this
     register stores the color of the inverse uppercase letters. Shadow
     for 53272 ($D018). Used for the background color in GR.0 and
     GR.8. Both use COLOR1 for the luminance value.

     Despite the official limitations of color selection in GR.8, it is
     possible to generate additional colors by "artifacting", turning
     on specific pixels (.5 color clock each) on the screen. Taking
     advantage of the physical structure of the TV set itself, we
     selectively turn on vertical lines of pixels which all show the same
     color. For example:

     10   A = 40: B = 30: C = 70: D = 5: F
         = 20   GRAPHICS 8: POKE 87,7: P0K