Hi
is it possible to interface with parallel (like turnig on and off LED's)port directly using C language,,???
or i need a special software or driver.??
thanks
If you buffer the printer ports data pins with an 8 bit latching register using the par ports write pulse as a latch enable the register will always contain the last valid data byte written to the parrallel port, this should let you use the parport on an OS under any circumstances as long as you're allowed to write whole bytes to the port.
you'll probably only need a suitable dll if you happen to be working on the XP platform. a popular one is the inpout32.dll. you can study parallel port tutorials (in c) /* a good one is the one by craig peacock */
study also works and software written by others; they're everywhere on the web.