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Color Compare Register Format
Bit
7
6
5
4
3
2
1
0
Bit O-Bit 3
Color Compare 0
Color Compare 1
Color Compare 2
Color Compare 3
Not Used
Enable Set/Reset-These bits enable the
set/ reset function. The respective memory plane
is written with the value of the Set/Reset register
provided the write mode is O. When write mode
is 0 and Set/Reset is not enabled on a plane, that
plane is written with the value of the processor
data.
Color Compare Register
This is a write-only register pointed to by the value in the
Graphics 1 and 2 address register. This value must be hex 02
before writing can take place. The processor output port address
for this register is hex 3CF.
Enable Set/Reset Register Format
Bit
7
6
5
4
3
2
1
0
Bit O-Bit 3
Enable Set/Reset Bit 0
Enable Set/Reset Bit 1
Enable Set/Reset Bit 2
Enable Set/Reset Bit 3
Not Used
Color Compare-These bits represent a 4 bit
color value to be compared.
If
the processor sets
48 IBM Enhanced Graphics Adapter
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