How to change the print options in POS?

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I would like to use POS with my custom printer. So the form of the bill /invoice is formated for a small printer. I would like to print on normal A4 paper. how can I edit the settings of the outgoing printing in POS?

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Usually POS requires COM device to print. You should read the printer programming manual to see how to call the command. If USB, you should use the vendor's USB library.