Apple IIgs #63
Master Color Values

Revised by Dave Lyons (May 1991)
Written by Jim Luther (July 1989)

This Technical Note documents master color values used for the Apple IIgs text, text background, and border colors.

Changes since July 1989: Added information on the standard QuickDraw II 640-mode color table and provided a 320-mode color table that produces similar colors.


Border Color Values

There are times when you may want to make parts of the IIgs Super Hi-Res screen the same color as the text, text background, and border colors. This is particularly useful when using the Apple II Video Overlay Card. Table 1 lists each color using the names from the Control Panel CDA, the color register values used for that color by the color registers, and the master color value used for that color by the Super Hi-Res screen.


                  Color    Color Register    Master Color
                  Name         Value            Value
                  ---------------------------------------
                  Black         $0              $0000
                  Deep Red      $1              $0D03
                  Dark Blue     $2              $0009
                  Purple        $3              $0D2D
                  Dark Green    $4              $0072
                  Dark Gray     $5              $0555
                  Medium Blue   $6              $022F
                  Light Blue    $7              $06AF
                  Brown         $8              $0850
                  Orange        $9              $0F60
                  Light Gray    $A              $0AAA
                  Pink          $B              $0F98
                  Light Green   $C              $01D0
                  Yellow        $D              $0FF0
                  Aquamarine    $E              $04F9
                  White         $F              $0FFF
                  ---------------------------------------

                      Table 1 - Master Color Values

The Apple IIgs Hardware Reference documents the color registers at $C022 and $C034, and the Apple IIgs Toolbox Reference, Volume 2 documents the master color values.

Standard 640-mode Color Table

The description of dithering on pages 16-35 and 16-36 of Apple IIgs Toolbox Reference, Volume 2 is correct, but some of the color values in Table 16-5 are incorrect. Table 2 lists the standard QuickDraw II 640-mode color table:


                  Color Table    Color      Master Color
                    Offset       Name          Value 
                  ---------------------------------------
                      $0         Black         $0000
                      $1         Red           $0F00
                      $2         Green         $00F0
                      $3         White         $0FFF
                      $4         Black         $0000
                      $5         Blue          $000F
                      $6         Yellow-green  $0FF0
                      $7         White         $0FFF
                      $8         Black         $0000
                      $9         Red           $0F00
                      $A         Green         $00F0
                      $B         White         $0FFF
                      $C         Black         $0000
                      $D         Blue          $000F
                      $E         Yellow-green  $0FF0
                      $F         White         $0FFF
                  ---------------------------------------
                     
                  Table 2 - Standard 640-mode Color Table

Table 3 shows Master Color values you can use in 320-mode to get close approximations of the sixteen standard 640-mode "solid" (really dithered) 640-mode colors.


                   Color Table  Color        Master Color
                     Offset     Name            Value 
                   -------------------------------------
                       $0       Black           $0000
                       $1       Deep Blue       $0008  
                       $2       Yellow-brown    $0880
                       $3       Gray            $0888
                       $4       Red             $0800 
                       $5       Purple          $0808 
                       $6       Orange          $0F80 
                       $7       Pink            $0F88 
                       $8       Dark Green      $0080
                       $9       Aqua            $0088
                       $A       Bright Green    $08F0
                       $B       Pale Green      $08F8
                       $C       Gray            $0888 
                       $D       Periwinkle Blue $088F
                       $E       Yellow          $0FF8
                       $F       White           $0FFF
                   -------------------------------------
            
                  Table 3 - Standard 640-mode Color Table

Further Reference


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