| Technical specifications |
| Digital Input / Output |
| Digital type | 82C55 |
| Configuration | 2 banks of 8, 2 banks of 4, programmable by bank as input or output |
| Number of channels | 24 I/O |
| Output high | 3.0 volts min @ -2.5 mA |
| Output low | 0.4 volts max @ 2.5 mA |
| Input high | 2.0 volts min, 5.5 volts absolute max |
| Input low | 0.8 volts max, -0.5 volts absolute min |
| Power-up / reset state | Input mode (high impedance) |
| Interrupts | 2 through 7, jumper selectable |
| Interrupt enable | External (IR Enable), logic low enabled (disabled by default via internal 10k resistor to +5V) |
| Interrupt sources | External (IR Input), rising edge |
| Miscellaneous | Locations provided for installation of pull-up or pull-down resistors. |
| Power consumption |
| +5V | 170 mA typical, 270 mA max |
| Environmental |
| Operating temperature range | 0 to 70 °C |
| Storage temperature range | -40 to +100 °C |
| Humidity | 0 to 90% non-condensing |
