● 24 channels of TTL digital I/O lines.

● All I/O lines buffered by tristate transceivers.

● Outputs sink 24mA and source 15mA.

● Four- and eight-bit groups independently selectable for I/O.

● Pull-up resistors to provide CMOS and contact closure compatibility.

● Cable crosstalk suppression by grounds on all even-numbered conductors.

● 50-pin connector for compatibility with Western Reserve Controls, Opto-22, Gordos, Potter and Brumfield, etc.

● External interrupts.

● Automatic Test Systems

● Laboratory Automation

● Robotics

● Machine Control

● Security Systems, Energy Management

● Relay Monitoring and Control

● Parallel Data Transfer to PC

● Sensing Switch Closures or TTL, DTL, CMOS Logic

● Driving Indicator Lights or Recorders

Drivers for various operating systems are also provided, including active support for Windows XP -> 10 — all in both 32-bit and 64-bit flavors, and including consumer, server, and embedded varieties — as well as the 2.6 and newer Linux kernels and recent OSX / macOS versions. Many products continue to ship with driver support for Windows 95, 98, Me, NT4, and Windows 2000, but support for these operating systems is considered deprecated.