21. DIGITAL I/O PORTS

Helios has two groups of digital I/O ports and one digital interrupt circuit:

  • 3 8-bit ports named A, B, and C are included in the data acquisition circuit on the AV model and are available on connector J17 on that model.

  • 2 8-bit ports named D and E are provided by the digital I/O circuit integrated into the Vortex processor and are available on connector J7 on all models.

  • An interrupt on the ISA bus may be triggered using the EXTTRIG pin on connector J17 on the AV model

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