!!!4-color Characters
The color of each pixel (4 in a line instead of the usual 8) depends on the bit combination of the byte in the character definition.

||Bit Pair||Color||Address dec||Address hex||comment
|00|[COLOR4] BAK|712|$02C8|
|01|[COLOR0] PF0|708|$02C4|
|10|[COLOR1] PF1|709|$02C5|
|11|[COLOR2] PF2|710|$02C6|if bit 7 of character code = 0
|11|[COLOR3] PF3|711|$02C7|if bit 7 of character code = 1

!!!Example
character "A" (code=65) would be displayed as
{{{
00000000 BAK BAK BAK BAK
00011000 BAK PF0 PF1 BAK
00111100 BAK PF2 PF2 BAK compare with line 3 below
01100110 PF0 PF1 PF0 PF1
01100110 PF0 PF1 PF0 PF1
01111110 PF0 PF2 PF2 PF1 compare with line 6 below
01100110 PF0 PF1 PF0 PF1
00000000 BAK BAK BAK BAK
}}}

character "inverse A" (code=193 Bit 7 set!) would be displayed as
{{{
00000000 BAK BAK BAK BAK
00011000 BAK PF0 PF1 BAK
00111100 BAK PF3 PF3 BAK compare with line 3 above
01100110 PF0 PF1 PF0 PF1
01100110 PF0 PF1 PF0 PF1 
01111110 PF0 PF3 PF3 PF0 compare with line 6 above
01100110 PF0 PF1 PF0 PF1
00000000 BAK BAK BAK BAK
}}}

To try this, type (works only on an ATARI XL or XE):
{{{
GRAPHICS 13:? #6;"A A A":? #6;"A A A":REM the second 3 "A"s are inverse video!
}}}

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see also: [Color topics|Color_topics]