Epson FX-80 Operation Manual page 140

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LESSON
4 _
The proportional data of the attribute is explained here.
The proportional data of the attribute is referenced during proportional printing
and specifies the starting and ending positions of the print area. This data is
effective only during proportional printing.
The proportional data is all of the bits of the attribute with the exception of the
MSB. Of these seven bits, the high-order 3 bits specify the starting position of the
print area and the low-order 4 bits the ending position of the print area.
MSB
1
o
o
Attribute
0
data
1
o
1
LSB
1
{
0: with descender
Descender
} ; "_0"'
d~."d
..
1
1
J
Proportional data
f
J
i: Starting position
j: ending position
0", i ",7
i+4", j '" 11
The maximum value of the low-order 4 bits is 11 and the minimum width for a
character is 5. If the setting of the proportional data is not within this range, the
data will be ignored and the width of the character will be automatically set at
(11)0·
o
1 2 3 4 5 6 7 8 9 10 11
-
-.,-
-
-
~
-
-~
' -
-
-~ ' -
-
-~
-
-
-~
-
-
-~
-
-
-.-
-
-
-
,
' - - . . , - - - - - - -
Print position Undefined
For example, to specify the print positions of
the figure at left, if the descender is specifed
(MSB =0), the proportional data will become
the attribute, in this case (21 )0. If the descender
is not specified, (128)0 (MSB=l) is added to
the proportional data to obtain the attribute.
(21)D+(128)0=(149)0
The print area that can be defined by the proportional data is dot positions 0 to 11.
Of these, however, the user can define a maximum of 11 dot positions. The last dot
j .
position is always left blank.
I .
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