Troubleshooting an HD44780? 20x4 char LCD
Hello, I recently bought a charactor LCD and wired it up according to the ever so poular wiring diagram for parallel port with the 100k /10k pots. I turned everything on, adjusted the controls, and boom! I get the familiar 2 solid line default screen. Good start. I proceed to plug it into 2 different computers (XP/winamp/LCDdisplay and dos/MPXPlay) and try every bios setting for parallel ports, and even cut my 22ft parallel port cable down to 7ft.
Not once have I gotten anything but those two solid bars. Do you guys have any ideas on what I could try or what I could setup to test to see if the thing should be working, and what I need to do to get MPXPlay to use it? I also adjusted all of the settings in the .ini file to no avail.
I might try to get a couple bucks on ebay for it, and then buy a new one, but I am afraid that the same thing will happen the new one...
Any help on diagonising my problem would be appreciated!