DTK Computers Technical Information Sheet for PII-124 S=shorted, O=open DIP switch 1=on 0=off JP2:Parallel Port Address JP3:Light Pen o o-o LPT1 <1> Light pen input o-o o LPT2 <2> Not used <3> Light pen switch JP4:B&W Composite Enable <4> Chassis ground S Enable monochrome port <5> +5 volts O Disable monochrome port <6> +12 volts