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Domain: beyondlogic.org
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Stories · 1
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Parallel Port I/O Access Under Win2K?
stumped-by-MS asks: "I'm having a tough time accessing my parallel port under Win 2K. I'm working off of a Dell Precision P4 workstation, and using Microsoft ASseMbler to run simple programs involving IN and OUT commands. Initially I read about 2K's strict I/O control, and found the PortTalk driver to get around it. This driver, when coupled with the supplied allowio.exe, is supposed to give any program User level 0 to any specified port. Using the program (syntax:allowio test.exe 0x378) allows access to the base address just fine, however with base+1 (0x379), the input port, is still unresponsive. Using allowio to specifically give access to that port also fails, as well as giving my program access to all ports, which I would rather not do in the first place. " Is there some hidden set of permissions a program must have before they are allowed access to certain I/O ports under Windows 2000?"Am I missing some concept here? As I understand it, allowing access to base=0378H should give access beyond 0x380! If anyone knows what I am doing wrong, or the location of some software that does things right, it would help me a lot."