Try the series driver (specifically the APD (Advanced Printer Driver) ) or the Seiko SLP driver. Many POS-8220 units emulate these protocols.
Because these printers are manufactured by various OEMs but share the same internal chipsets and model numbers, the driver installation process is usually identical across the board. These printers are favored by small business owners because they are affordable, reliable, and use standard 80mm (3-inch) thermal paper. Try the series driver (specifically the APD (Advanced