Model: HP D640, Version 4.01 rev part 1
Operating System: Windows 95 (Note: might work with other versions of this os.)
The PostScript Driver Update is designed exclusively for HP D640 Printers with the PostScript option. The driver is compatible with PCs running Windows 95 or Windows NT 4.0. Installation Instructions: Create installation diskettes by saving the disk images (.exe files) to your PC, double-clicking on each disk image icon, inserting a floppy, and pressing ENTER. The function code update diskettes are loaded directly into the printer; the driver diskette is used with the Windows "add printer" wizard.