Logical Operations - Yamaha V9938 Programmer's Manual

4.3. Logical operations

When executing logical commands LINE, PSET and LOGICAL MOVE, it is possible to
define logical operation to be done on the color of the pixels. The four bits identifying the
logical operation should be written in lower four bits of R#46 (command register) together
with the command code.
Name Operation
IMP DC=SC
AND DC=SC&DC
OR DC=SC|DC
XOR DC=SC^DC
NOT DC=!SC
Invalid
TIMP If SC=0 then DC=DC else DC=SC
TAND If SC=0 then DC=DC else DC=SC&DC
TOR If SC=0 then DC=DC else DC=SC|DC
TXOR If SC=0 then DC=DC else DC=SC^DC
TNOT If SC=0 then DC=DC else DC=!SC
Invalid
*SC = source color code
*DC = destination color code
© 1985 ASCII CORP. / NIPPON GAKKI CO.
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LO2 LO1
0 0
0 0
0 1
0 1
1 0
1 0
1 1
1 1
0 0
0 0
0 1
0 1
1 0
1 0
1 1
1 1
© 2010-2015 Eugeny Brychkov
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