Always set the printer to ESC/POS emulation (via DIP switch) before using non-NCR drivers.
This guide assumes you have the NCR_OPOS_7198_Setup.exe or the extracted driver folder. ncr 7198 epic driver download
7198 EPiC Driver for Dell - OptiPlex 3040 - DriverIdentifier Always set the printer to ESC/POS emulation (via