| Port |
Port Name |
Description |
| Port A Relay Driver Outputs |
| A-4 |
LED Clock |
Clock pulses for serial LED display |
| A-5 |
LED Data |
Data signals for serial LED display |
| A-6 |
LED Write Enable |
Enable serial interface for LED display |
| Port B Digital Inputs |
| B-1 |
IR Zone 1 |
Indicates received IR signal came from Zone 1 |
| B-2 |
IR Zone 2 |
Indicates received IR signal came from Zone 2 |
| Port C Digital Outputs |
| C-1 |
DVC Enable |
Enables serial interface for Digital Volume Control |
| C-2 |
DVC Clock |
Clock pulses for Digital Volume control |
| C-3 |
DVC Data |
Data signal for Digital Volume Control |