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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Stanley Stein On

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.