How to prevent WinXP from sending non-zero bits to parallel port when loading Windows?
Posted on 2003-11-06
Good day. I am having problem with my parallel port which is connected to a simple DIY alarm device. My alarm will sound whenever a "1" was send to pin 2 (or Data Port) of LPT1, and off when "0" bit was sent. The alarm is working properly using Visual Basic program I developed.
The problem is, when Windows is loading, it seems that XP is sending some non-zero bits to LPT1, causing my alarm to sound. Probably it's detecting the parallel port. Is there any way to prevent XP to do so so that my alarm won't sound everytime I start/restart my PC?
Thanks and hope to hear from you soon.