ESC/P 2: license, DC1 and DC3 commands, printing quality switch, stdbool.h, some clean-up#6787
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Summary
DC3 disables parsing anything until DC1 is seen (you can make comments out of this). Printing quality defaults to draft because that's the off position according to the manual of EX-1000. As for the rest, pretty mundane stuff.
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References
https://files.support.epson.com/pdf/general/escp2ref.pdf