Formatted receipt

Free text (ESC/POS mnemonic notation)

One instruction per line: ESC/GS/FS/LF/CR/HT/NUL as command names, 0xNN as a raw byte, anything else as literal text. Trailing # comment is ignored. Example:

ESC a 0x01   # Align: Center
Hello        # literal text
LF
ESC E 0x01   # Bold on
World
LF
ESC E 0x00   # Bold off
GS k 0x03 12345678 0x00   # EAN8 barcode
GS V 0x00    # Full cut

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