Color Registers - Yamaha V9938 Programmer's Manual

2.1.3. Color registers

Color registers are used to control MSX-VIDEO text and background screen colors,
blinking and other functions.
MSB
R#7
MSB
R#12
In TEXT2 mode, if attributes for blinking are set, color set in this register R#12 and in
register R#7 are displayed alternatively (blinked).
MSB
R#13
In the TEXT2 mode and in bit map modes of GRAPHIC4 to GRAPHIC7 two pages can
be alternatively displayed (blinked). Write to this register R#13 in order for blinking to start.
MSB
R#20
R#21
R#22
The above values of color burst registers are preset on power-on. If all the bits in all
three registers are set to 0, color burst of the composite video is not performed. If values
are returned to above values, VDP will start generating normal color burst signal.
© 1985 ASCII CORP. / NIPPON GAKKI CO.
7 6 5
TC3 TC2 TC1
Text color in TEXT1 and
TEXT2 modes
7 6 5
T23 T22 T21
Color part 1
7 6 5
ON3 ON2 ON1 ON0
Display time for even
page
7 6 5
0 0 0
0 0 1
0 0 0
4 3 2
TC0 BD3 BD2
Screen margin /
backdrop color
4 3 2
T20 BC3 BC2
Color part 0
4 3 2
OF3 OF2
Display time for odd
page
4 3 2
0 0 0
1 1 0
0 0 1
Page 19 of 108
1 0 LSB
BD1 BD0 Text and screen
margin color
1 0 LSB
BC1 BC0 Text and
background
blink color
1 0 LSB
OF1 OF0 Blinking period
register
1 0 LSB
0 0 Color burst
register 1
1 1 Color burst
register 2
0 1 Color burst
register 3
© 2010-2015 Eugeny Brychkov