Epson 2250 - Manual (Page 57)

Using the Default-Setting Mode
9. Turn off the printer to exit the default-setting mode.
Any changes you have made remain in effect until you change
them again.
10. After you exit the default-setting mode, slide the narrow cover
back on the printer.
Default settings
This section describes all the features in the default-setting mode.
Character spacing
When you select 10 cpi, the printer prints 10 characters per inch
(cpi). When you select 12 cpi, it prints 12 characters per inch.
Shape of zero
The printer prints the zero character with a slash (0) when the
setting is on, or no slash (0) when the setting is off. The slashed zero
allows you to easily distinguish between an uppercase “0” and a
zero when printing such items as program lists.
Using the Printer 3-13