randy
d2900361b3
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ReceiptBuilder#image implements GS v 0 raster printing (no image library needed for the demo -- a procedural 8px checkerboard proves it end to end). Skipped attempting the printer's real-time clock: unsure the TM-T20II actually has a battery-backed RTC (that's usually an option on higher-end models), not worth guessing at an undocumented command.