re wanted a to d hardware for a pc in ncr mpd ftcollinsco ncr com brad wright writes if you know much about pc s ibm comp you might try the joystick port though i haven t tried this myself i ve been told that the port has built in a d converters this would allow the joystick to be a couple of pots if you could find the specs this might just work for you i guess k connecting pins x y x and y or get an bit da converter merely a couple of transistors and resistors and an opamp to compare its output to the voltage you want to measure connect them to a spared printer port if you have one and do the rest by software stepwise refinement the port addresses for your printer ports are probably h lpt h lpt this should work well enough for your purposes hope this helps gmd schloss birlinghoven postfach d st augustin frg e mail peter hendricks gmd de ph zi gmd dbp de ph gmd de
