Epson ActionPrinter 4500 User Manual page 115

Enhancing Your Printing
The print quality and font must be set separately, using SelecType or
the ESC x and ESC k commands. There are two more things to
consider when using the Master Select command:
Master Select cancels any of the other listed features that you do
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not set. For example, if you have already set a different character
width and you use Master Select to set emphasized double-strike,
the character width is reset to 10 cpi.
Proportional spacing overrides 10, 12, and 15 cpi.
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Software and Graphics
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