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Eleven PPI chips (82C55) provide a total of 264 I/O lines. Of these, 240 lines are buffered by solenoid drivers. The high-voltage I/O lines are hardware configurable as inputs or outputs. The inputs can take up to 35V DC. The outputs are capable of sinking 350 mA at 50V per line, and they can directly drive solenoids, relays, or lights.