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Here, the value of n defines the print style to be selected. The
value of n can range from Oto 255, which is the range of values
that can be stored in one eight-bit byte. If you look at each bit in
this byte, you’ll find that each one represents a printing style
variation. Adding the binary values of the selected bits gives the
value of n for a particular combination of print styles.
Table 4-10 shows the decimal values of the bits in the Master
Print byte. To calculate the value n for a particular combination
of printing styles, just add the decimal values of the features
that you want to combine.
Table 4-10
Values of mixing print styles for Master Print
Bit
Print style
Decimal value
1
Elite print
1
2
Proportionalprint
2
3
Condensedprint
4
4
Emphasizedprint
8
5
Boldfaceprint
16
6
Expandedprint
32
7
Italics
64
8
Underline
128
For example, if you want to select elite expanded boldface
print, you would calculate the value of n like this:
Elite
1
Boldface
16
Expanded 32
n=
49
The command would look like this:
CHR$(27);’’!’’;CHR$(49)
To better understand the way the print modes work, consider
that each mode except pica (pica is the default) has a separate
switch that can turned on and off via software. Once the switch
is on, it stays on until turned off. However, when two modes
that conflict are turned on at the same time, the printer must
choose which one to use.
For example, suppose you turn on both Elite and Emphasized
modes. These cannot combine, so the printer must make a
choice; in this case, the printer chooses Elite.