Try puting the port in output mode. That way when you write a bit pattern
youc an easily see with a DMM.
BTW - What kind of error you having when you use the port in input mode? I
am no hardware guy but I think for input mode, the lines need to be tied to
+ve or GND, otherwise they are floating, unless the equipment you are
connection to explicitly gives high or low.
vishi
"DerekG" wrote in message
news:5065000000050000004ABE0000-1031838699000@exchange.ni.com...
> Cheers for the reply.
> I am using Win95 (I've tried Win2K too).
> I know 0x300 is OK cause I wrote a DOS program to
> sample the ports and this works OK in a window
> under WIN95.
> DG