Fingerman,
Others on this forum will thank you for not cross posting....
I have been printing to your plotter model using the standard HP-supplied driver from a mactel laptop without issue. You may have other problems but I don't think it's a driver/intel issue. Also, how can a G5 be an intel machine?!
Best,
Chazz
Nattering nabob of negativism
2023 MBP M2 Max 32GM. MaxOS-Current