Epson ActionPrinter Manuel D’Utilisation

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Selecting Typestyles
Character spacing
For all of the eight built-in fonts, you can choose character spacing
of 
10, 12, 15, 
17, or 20 cpi (characters per inch), or proportional
spacing using the DIP switches or software commands.
In the 10, 12, 15, 
17, 
and 20 cpi modes, each character gets 
an
equal amount of space. In proportional mode, the spacing varies
from character to character. A narrow letter like the lowercase i
receives less space than the uppercase W.
The printout below compares the different types of spacing:
This is 10 cpi printing.
ABCDEFGHIJKLMNOPQRSTUVWXYZ
This is 12 cpi 
printing.
ABCDEFGHIJKLMNOFQRSTUVWXYZ
This is 15 cpi printing.
ABCDEPCHIJKLFlNOPQRSTUVUXYZ
Thie is 17 cpi printing.
ABCDEFGHIJKLMNOPQRSTUVWXYZ
This is 20 cpi priding.
ABCDEFGHIJKLMNOPQRSTUVWXYZ
This is proportional printing.
ARCDEFGHIJKLMNOPQRSTIJVWXYZ
If you choose 
15 cpi 
for Epson Roman, Epson Prestige, Epson
Script, OCR-B or Epson Orator, 15 cpi Courier is printed.
Using the Printer
3-15