Epson 1500 - Manual (Page 30)

(Type the ESC codes by turning NUM LOCK on, holding down
the Alt key, and entering the number 27 on the keypad. The
spaces in the command line above are to separate the codes
visually. In your typing, do not leave spaces before the escape
codes.)
The printed page should contain a vertical rule 10 dots wide
and 1200 dots long.
WordPerfect 5.1
1. Press Shift+F8.
2. Press 4.
3. Press 6.
4. Press 2.
5. Press 1.
6. Type the command. (Use less-than and greater-than signs to
enclose the decimal numbers in the command.)
For example, to draw a vertical rule 10 dots wide and 1200
dots long, type:
7. Press Enter four times.
8. You can press Alt+F3 to verify that your printer command is
embedded in the text.
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Controlling Your Printer