Epson 1500 - Manual (Page 236)

If you select proportional, 10 cpi and condensed, determine
margin units. If you change the setting of ORIENT., PAGE
SIZE, or WIDE PAGE (when PAGE SIZE is set to A4 or F4), the
left margin defaults to 0.
R-MARGIN-Use this option to set the right margin. Margin
units are determined by current pitch (characters per inch) and
the condensed setting (ON or OFF). The factory setting is 80.
Menu/submenu
R-MARGIN 80
Availableoption
1 to available
If you select proportional, 10 cpi and condensed, determine
margin units. If you change the setting of ORIENT., PAGE
SIZE, or WIDE PAGE (when PAGE SIZE is set to A4 or F4), the
right margin defaults to the setting in the following table:
LQ and FX Emulation Modes C-5