Epson 1500 - Manual (Page 179)

Introduction
HP emulation allows you to use application software designed
for the HP LaserJet series IIP and III printers. The ActionLaser
1000 uses HPIIP emulation (LJ-2P) and the ActionLaser 1500
uses HPIII emulation (3/P/Si) as their default emulations.
Most of the features of the LJ-2P and 3/P/Si emulations are the
same. The major difference is that scalable fonts and vector
graphics are available only in 3/P/Si emulation.
This section gives you information about using HP emulation.
It describes the unique features of your printer’s HP emulation
as well as the differences between your printer’s HP emulation
and printing with an HP LaserJet itself.
You will also find information on Epson GL/2 emulation along
with a list of GL/2 emulation commands.
ActionLaser to HP LaserJet print feature comparison
Operating the printer in HP emulation differs slightly from
operating an HP LaserJet series IIP or III because the printers
use different technologies. The differences in printing are
explained below.
B-2 HP Emulation Mode