The Apple II's video circuit outputs the picture signal to NTSC monitor. The picture
signal contains the binary data to be translated into 16 colors. NTSC's chroma wheel has 8
hues and 4 phases.
How can degrees be determined from the group of 4 bits below?
Low Brightness
1000 = 0 degrees
0100 = 90 degrees
0010 = 180 degrees
0001 = 270 degrees
High Brightness
1101 = 0 degrees
1110 = 90 degrees
0111 = 180 degrees
1011 = 270 degrees
Medium Brightness
1100 = 45 degrees
0110 = 135 degrees
0011 = 225 degrees
1001 = 315 degrees
If I increase from group of 4 bits to group of 6 bits to support 64 colors like Nintendo
NES, the master OSC 21,477,270 MHz chip will be used for NTSC monitor.
NTSC's chroma wheel has 12 hues and 6 phases.
How can group of 6 bits be interpreted into degrees? Please fill the degrees when "?
degrees" are shown in the bottom of group of 6 bits.
100000 = 0 degrees
010000 = 60 degrees
001000 = 120 degrees
000100 = 180 degrees
000010 = 240 degrees
000001 = 300 degrees
110000 = 30 degrees
011000 = 90 degrees
001100 = 150 degrees
000110 = 210 degrees
000011 = 270 degrees
100001 = 330 degrees
110001 = 0 degrees
111000 = 60 degrees
011100 = 120 degrees
001110 = 180 degrees
000111 = 240 degrees
100011 = 300 degrees
010001 = ? degrees
101000 = ? degrees
010100 = ? degrees
001010 = ? degrees
000101 = ? degrees
100010 = ? degrees
Thanks,
EB
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