HP 4 FAMILY - Manual (Page 65)

Merge Control
Command (HP-GL/2)
The Merge Control (MC) command specifies the raster
operation (ROP’s) to be performed in HP-GL/2. Raster
Operations specify how source, destination, and patterns
are combined to produce final images. This command
supports all 256 Microsoft Windows ternary (ROP3)
raster-operation codes.
MC [mode, [opcode] ] ;
1
For opcode ROP values refer to Table 2-6, Logical Operation.
mode
0 = opcode value is ignored; printer sets ROP to 252.
1 = opcode value is used as the ROP value. If no
opcode value is sent, printer sets ROP to 168. If
opcode is out of range (some value other then
0-255), the command is ignored and the default
ROP of 252 is used. (For example: MC1,60;
MC1,60-; MC1,+60; MC1,60+; all set the ROP to
60; however, MC1,-60; or MC1,300; set the ROP
to the default value (252).
Notes This command is the HP-GL/2 version of the PCL Logical
Operation command.
This command sets a ROP value which affects not only
HP-GL/2 operation but also the PCL ROP value.
The MC command is defaulted by an IN command.
Parameter Format Functional Range Default
mode clamped integer 0 or 1 0 (ROP 252)
opcode clamped integer 0...255
1
168, 252
Merge Control Command (HP-GL/2)
Printer-Specific Differences 2-29