Printing on MacOS can be less Plug&Play than one hopes for.
For default printer drivers on MacOS for the same printer:
- Postscript allows colour and monochrome (black & white / grayscale)
- PCL only allows monochrome (black & white / grayscale)
One solution for my OKI MC363 is to use the HP PCL driver and fake it as a HP Colour LaserJet 9500 (which provides a similar amount of memory, and colour duplex A4 printing):