Microsoft Windows NT, Beta October 1992
Problem Printing to Hewlett-Packard DeskJet Printers
System Error 21


The Microsoft Windows NT product group has recently identified a printing 
problem on some systems when printing to Hewlett-Packard DeskJet, 
DeskJet Plus and DeskJet 500 printers from Windows NT.  Error 21 is known 
to occur when attempting to print unless the printer was powered off when 
the system was booted.  The problem occurs due to a failure on the part of 
the parallel port driver to reset if the printer is turned on at 
initialization of Windows NT.  If you print to one of the aforementioned 
printers, you may encounter this problem.  

If you encounter this problem, please take the following steps to replace 
the driver as instructed below.  We appreciate our customers efforts in 
reporting problem areas and encourage you to continue working with us to 
improve the product.  If you continue to encounter similar problems, please 
let us know. 

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1.      First, close all applications running on the desktop.  

2.      Using the File Manager, locate PARALLEL.SYS in the Windows 
NT installation path.  For example, C:\WINNT\SYSTEM\DRIVERS.  From the 
menu, select File, Rename and rename this file to PARALLEL.OLD.

3.      Insert the floppy disk into a disk drive containing the updated 
version of PARALLEL.SYS. 

4.      Using the File Manager, click on the corresponding drive icon.  
Select PARALLEL.SYS and from the menu, select File, Copy, To: and type in 
the appropriate path destination.  For example, C:\WINNT\SYSTEM\DRIVERS.

5.      Exit File Manager. 

6.      Properly shutdown the system by pressing CTRL-ALT-DEL, Shutdown, OK.

7.      Restart Windows NT.