These boards interface TTL, on/off, hi/lo logic levels to a CompactPCI embedded computer system.  

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    AcPC424: Digital Input/Output Module Differential, TTL, Counter/Timer

    • 24 differential I/O, 16 TTL I/O
    • Four 16-bit counter/timer channels with six operating modes
    Consult factory for long-term availability.  
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    AcPC464: Digital Input/Output and Counter/Timer

    • 64 digital input/output channels
    • 16-bit counter/timer channels with six operating modes
    • Change of state and level interrupts.
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