You can download the official drivers for the HP Dual Serial USB Thermal Receipt Printer (A799) Go to product viewer dialog for this item. directly from the HP Support Portal Download and Installation Steps Identify Your OS : Visit the Official HP Software and Driver Downloads
To download the correct driver for your , please use the link below: hp a799 thermal printer driver download link
It is best practice to install the driver software before plugging the printer into the USB port. This prevents Windows from installing a generic, incorrect driver. You can download the official drivers for the