For new applications, consider the NI PCIe-6320 X Series board. It includes four 32-bit counters with a 100 MHz timebase, 16 analog inputs, and 24 digital I/O lines.
The NI PCI-6601 is a timing and digital I/O board for PCI computers. It offers four 32-bit counter/timers and up to 32 lines of TTL/CMOS-compatible digital I/O. You can perform a wide variety of counter/timer tasks with the PCI-6601, including encoder position measurement, event counting, period measurement, pulse-width measurement, pulse generation, pulse-train generation, and frequency measurement.
