ISA Digital I/O Board - 24 Channels, with Counter/Timer, 37-Pin Connector

CYDIO 24C - CyberResearch, Inc. (CyberResearch)

With our CYDIO boards you can turn your PC into an alarm system by sensing contact closures or use it to control lights, locks, motors, heaters, or any number of electronic devices that can be turned on and off. The high-current H models are powerful enough to light LEDs and drive solid-state relays. The CYDIO TTL models can sense and control 0 to 5V logic-level devices.