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SuperHires mode has a coarser granularity of color control than either
Hires or Lores modes. This is because the timing of color conversions at
these very high pixel rates requires special "tricks". There are only two
bits of red, green and blue color resolution per hires pixel.
In order to decode sprite and bitplane color information in SuperHires
mode, certain multiplexing occurs in the use of the registers. Instead of
4 bits of red, green, and blue for bitplane registers 0-3 stored as 0x0RGB
in four color registers, SuperHires bitplane colors are specially encoded
in the sixteen lower color registers:
R G B
---- ---- ----
Bitplane (Color 0) : ab-- cd-- ef--
Bitplane (Color 1) : gh-- ij-- kl--
Bitplane (Color 2) : mn-- op-- qr--
Bitplane (Color 3) : st-- uv-- wx--
BIT 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
C 00 . . . . a b a b c d c d e f e f
O 01 . . . . g h a b i j c d k l e f
L 02 . . . . m n a b o p c d q r e f
O 03 . . . . s t a b u v c d w x e f
R 04 . . . . a b g h c d i j e f k l
05 . . . . g h g h i j i j k l k l
R 06 . . . . m n g h o p i j q r k l
E 07 . . . . s t g h u v i j w x k l
G 08 . . . . a b m n c d o p e f q r
I 09 . . . . g h m n i j o p k l q r
S 0A . . . . m n m n o p o p q r q r
T 0B . . . . s t m n u v o p w x q r
E 0C . . . . a b s t c d u v e f w x
R 0D . . . . g h s t i j u v k l w x
0E . . . . m n s t o p u v q r w x
0F . . . . s t s t u v u v w x w x
SuperHires sprites are encoded in the upper sixteen color registers using
a similar scheme:
R G B
---- ---- ----
Sprite (Color 16) : AB-- CD-- EF--
Sprite (Color 17) : GH-- IJ-- KL--
Sprite (Color 18) : MN-- OP-- QR--
Sprite (Color 19) : ST-- UV-- WX--
BIT 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
C 10 . . . . A B A B C D C D E F E F
O 11 . . . . G H A B I J C D K L E F
L 12 . . . . M N A B O P C D Q R E F
O 13 . . . . S T A B U V C D W X E F
R 14 . . . . A B G H C D I J E F K L
15 . . . . G H G H I J I J K L K L
R 16 . . . . M N G H O P I J Q R K L
E 17 . . . . S T G H U V I J W X K L
G 18 . . . . A B M N C D O P E F Q R
I 19 . . . . G H M N I J O P K L Q R
S 1A . . . . M N M N O P O P Q R Q R
T 1B . . . . S T M N U V O P W X Q R
E 1C . . . . A B S T C D U V E F W X
R 1D . . . . G H S T I J U V K L W X
1E . . . . M N S T O P U V Q R W X
1F . . . . S T S T U V U V W X W X
About SuperHires color.
-----------------------
SuperHires color encryption is not reflected in the ColorTable.
The color encoding is, however, reflected in the ViewPort's
copper lists generated by graphics via MakeVPort(), SetRGB4(), etc.
Keep in mind that because of the loss of lower bits of precision in
specifying SuperHires colors, pastel colors in a closely graduated color
scheme may be visually difficult to distinguish from each other.