----------------------------------- ruscutie Sat Mar 29, 2008 6:29 pm QBASIC parallel port program ----------------------------------- hey.. i have this circuit.. when i try to program it using qbasic the LEDs in my circuit don't light up the lines i use are for i = 1 to 10000 out &h3bc, 2 next the address of port is right, i think... well if there is any way to check my address of the parallel port plz tell me.. and there is one thing.. the black wire {ground wire] which comes from the parallel is not supposed to be connected to my circuit 'coz its the ground wire but when i connect it the LED'S light up.. so i think it shows that there is not a problem in circuit but some problem in my programming... plz help me.. i'm attaching the image of my parallel port properties.. ----------------------------------- OneOffDriveByPoster Sat Mar 29, 2008 8:39 pm Re: QBASIC parallel port program ----------------------------------- Try &h378. ----------------------------------- ruscutie Sat Mar 29, 2008 9:36 pm Re: QBASIC parallel port program ----------------------------------- Try &h378. it still doesn't work:-( ----------------------------------- OneOffDriveByPoster Sat Mar 29, 2008 11:36 pm Re: QBASIC parallel port program ----------------------------------- and there is one thing.. the black wire {ground wire] which comes from the parallel is not supposed to be connected to my circuit 'coz its the ground wire but when i connect it the LED'S light up.. so i think it shows that there is not a problem in circuit but some problem in my programming... I think you are supposed to connect the ground wire to the -ve terminal of your circuit. (I am hoping that your circuit does not use batteries, etc.) ----------------------------------- ruscutie Sun Mar 30, 2008 2:09 am Re: QBASIC parallel port program ----------------------------------- and there is one thing.. the black wire {ground wire] which comes from the parallel is not supposed to be connected to my circuit 'coz its the ground wire but when i connect it the LED'S light up.. so i think it shows that there is not a problem in circuit but some problem in my programming... I think you are supposed to connect the ground wire to the -ve terminal of your circuit. (I am hoping that your circuit does not use batteries, etc.) my apologies... i think i should have explained more well i'm doing this for the 1st time... so there is a bread board, it has 16 LEDs on it... i have this parallel port... i soldered wires from Pin 2 to Pin 9 and these wires are now connected to the bread board... after that i soldered the black wire which is in pin 19 of the port... pin 2 to pin 9 are data pins which transfer data while pin 19 is the ground pin which helps to ground the circuit... i have a schematic which my teacher gave me... i'll scan it and attach it... i made the circuit (the teacher helped us), but now my circuit doesn't work (i'm doing it for the first time in my life and i don't know how to find mistakes or anything)... so while experimenting and trying to figure out my mistakes by using the trial and error method, i decided to connect the black wire which is not supposed to be connected... when i connected to the positive and the negative rows of my bread board (there are 2 positive rows and 2 negative rows in a bread board) my LEDs lit up.... there are four rows of LEDs and each row of LED lit up when i connected to the black wire to the appropriate positive or negative row... so i thought that there isn't a problem in my circuit (i still think it because of lack of knowledge)... so i tried to program it using qbasic (our teacher asked us to use it)... now nothing works except the black wire thing i told you about... i still have no idea whats wrong... i'm going to scan the schematic and attach it.. if any of you have any ideas, please help me... PS -- > I ATTACHED THE SAME FILE TWICE... FOR SOME REASON I WAS NOT ABLE TO DELETE THE 2ND FILE... SO PLEASE IGNORE THE 2ND FILE... THNX ----------------------------------- ruscutie Sun Mar 30, 2008 10:20 am Re: QBASIC parallel port program ----------------------------------- nerver mind guys... i got it... it was just the parallel port address, wat i thought in my 1st post... used a 8 yr old computer lying around in my house... the circuit worked like charm... :D ..