Apple includes built-in drivers for most HP printers.
Some users utilize driver repositories like DriverScape for older, pre-packaged drivers, such as the ljM1120-hb-pnp-win64 driver. hp m1120 printer driver
Original HP driver packages are available. Apple includes built-in drivers for most HP printers
The printer driver handles printing, but the often requires a separate manual setup on the M1120 MFP. hp m1120 printer driver
Choose and click Next. Select Use an existing port (choose USB001 or similar).