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K
Graphics Mode
The printer supports the Epson FX-80 Single, Double, and
Quadruple Density Graphics. It does not emulate the FX-
80 consecutive-dot or slower speed with increased density
limitations. A unique <ESC>command is used to enter
each graphics density.
In
each density, two additional pa-
rameters in the command specify the number of horizontal
dot columns to reserve for graphics data. The number of
vertical dot rows per column that will be reserved for
graphics data is determined by the type of computer sys-
tem you are using (7-bit or 8-bit). Figure 10.1 shows how
the different systems plot dots in a column. Notice that 7-
bit systems do not use the top and bottom dot rows while
8-bit systems use the top row.
8
6
5
4
3
2
1
o
;ele
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18
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• •
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7-Bit
Format
Figure 1
8
7
6
5
4
3
2
1
o
•
•
I.
el.
•
I.
•
•
•
•
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8- Bit Format
Dot positions 1-8 correspond to the 8 bits in a binary
number. The ASCn equivalent of a binary bit pattern
is sent to the system to tell which dots to print. A" 1"
means "ON" or "print" and "0" means "OFF" or "don't
print." Since ASCn values are used, there is a single,
unique decimal number (0-255) assigned for each possible
combination of the "ON" and "OFF' bits. This means
there is a unique number for each possible combination of
dot patterns.
Appendix E
E-33
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