HP 8712C User Manual page 201

The analyzer can send print commands in PCL5, PCL, Epson, or HP-GL
modes. Recommended usages are:
Use PCL5 mode for maximum speed, if your printer supports it.
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HP LaserJet III/4/5 models support PCL5. Typical time to generate and
send hardcopy output to a PCL5 printer is 1 to 10 seconds.
Use PCL or Epson language if your printer does not support PCL5. The
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analyzer uses Epson ESC Pl commands that are common to IBM mode
devices and FX-86e/FX-800 mode Epson compatible devices.
Use HP-GL language for plotters.
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Using Instrument Functions
Connecting and Configuring Printers and Plotters
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