Direct parallel port access under windows XP for DOS applications
From: Ran (ran_tao_at_netvision.net.il)
Date: 7 Dec 2003 11:40:00 -0800
I will describe my problem, hoping that anyone can help with a
I am running an old DOS application. This application cannot be
altered due to many reasons.
This application uses an old HASP dongle. The hasp drivers for dos
dongles does not work with this application. The only way I could make
this application work, is by writing a code similar to UserPort, which
changes the IO permission map for the calling process.
My problem is that recently new display adapters drivers like ATI
Radeon will not allow me change the TSS to enable direct port access
for the 16Bit process. When disabling the display adapter driver and
using the default windows XP driver, this problem is "solved", of
course not having a display driver reduces performance but I can live
Second problem is that when using the UserPort with new HyperThreading
motherboards, when the 16bit application tries to access the port, the
I tried using direct-io, disabling the printer port and enabling
378-37F for the EXE I am using, but with no success. It did not get
the correct response from the dongle.
I think it's because the EXE is using direct bios calls and a virtual
device driver cannot capture the calls and handle them correctly.
Does anyone have a solution to this problem? Any ideas?
I would appreciate any help you can offer...
Thanks for your time,