Epson ActionLaser 1600 Reference Manual page 91

ZeroChar
The ZeroChar item determines whether the printer prints a
slashed zero 0) or an unslashed zero (0). This feature is useful
for clearly distinguishing between an uppercase letter 0 and a
zero when printing documents such as programming lists.
ZeroChar=
BitImage
With BitImage set to Dark or Light, your printer can correctly
emulate the graphics densities set with the printer commands.
When you select Dark, the bit image density is high. When you
select Light, the bit image density is low.
Bitimage=
The BarCode setting converts bitmaps to bar codes by
automatically filling in any vertical gaps between dots. This
produces unbroken vertical lines that can be read by a bar code
reader.
Note:
This mode reduces the size of the image being printed and may cause
some distortion when printing bitmap graphics.
0 (Default)
Dark (Default)
Light
Barcode
Using Other Printer Emulations
5-9