Instruction manual

6.4.4 PixelMask Register
The PixelMask Register is used in opaque stipple mode to determine which pixels
are to be operated on. Each bit of the register corresponds to one pixel. If a bit is
set, the corresponding pixel is affected by a stipple operation. If the bit is not set,
the corresponding pixel is unaffected by a stipple operation. At initialization and
at the end of each operation the entire contents of the PixelMask Register are set
to 1s.
The PixelMask Register must be set to all 1s in order to ensure proper operation
in simple mode. The PixelMask Register is not explicitly used in transparent
stipple mode, transparent line mode, opaque line mode, or copy mode.
Note
Value at initialization: FFFF.FFFF
The register’s format and contents are:
0031
MR−0089−93RAGS
PIXELMASK
6.4.5 Foreground and Background Registers
The foreground and background registers are used in stipple and line modes. The
foreground defines the foreground color for the operation, the background defines
the background color for the operation. In 8 or 16 bits/pixel modes, software
must replicate the foreground and background values across the 32 bits of each
register.
Note
Both values at initialization: 0
The registers’ format and contents are:
0031
FOREGROUND
0031
MR−0090−93RAGS
BACKGROUND
6–14 CXTurbo Graphics Subsystem: 300/500 Models