Need to upgrade an old ISA PC that has a PC-DIO-24 and runs a Visual C++ 6.0 app which uses the NI-DAQ 6.1 functions DIG_Prt_Config(), DIG_In_Prt() and DIG_Out_Prt(). The new PC has only PCI slots. Want to use the PCI-6503, which is pin-compatible, but am not sure which "Traditional" NI-DAQ software versions [6.1, 6.8.1, 6.9.3, 7.0] support it. Would like to reuse existing application software, if possible. Could not figure out where to find this info on NI's web site.