Hello,
I tried to do this in Windows XP and was unsuccessful. The steps work fine on a Win95/98 machine, however. Thus, I am forced to conclude that Windows 2000/XP (and possibly NT) discontinued support for loading DOS-mode device drivers for device files like DEV1. I would recommend contacting the printer manufacturer to see if they have a current driver that could solve this problem, or possibly downgrading your OS.
Scott B.
National Instruments
Applications Engineering