Lexmark Winwriter 600 for Windows 2000 Pro

I am seeking a printer driver that will allow 600x600 dpi
printing for the above mentioned printer. I can use the
HP Laserjet II series printer to work in Win2000 but the
maximum resolution that driver allows is 300x300. I know
the printer is capable of 600x600, but I have been unable
to locate a driver that would work.

I am willing to even pay someone to develop a driver if
that person would contact me. Lexmark does not support
the printer, but I know it works.

Any help is appreciated.