> Can anyone know why the Andrew M. Errington PROG84 don't work with WIN NT 3.51
> It works fine with my win95 but not with the Wint NT.

I'm not sure abaout this, but I think NT does not allow any application
direct access to the hardware ports of the PC.  95 and 3.1 is still
leniant in that department.  In NT you need a driver of some sorts with
high enough priviledge level to access the hardware.

Just thoughts though...

Niki