HP 54501A Programming Reference Manual page 182

MASK
Table
11-1.
Display Mask
Byte.
Bit
7
6
5
4
3
2
1
0
Weight
128
64
32
16
8
4
2
1
Screen Area Effected
unused
Menu Area
Timebase Information
Measurement Result
Area
Graticule
Area
unused
Status
Line
Advisory
Area
HP 54501A
Programming
Display Subsystem
11-13