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.
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.
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
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