| Photon Counting Inputs | 3 Independent Channels, TTL |
| PCI Bus Width | 32 bit |
| PCI I/O Resources | 1 (128 bytes) |
| PCI Memory Resources (in order) | 3 (128 bytes, 64 bytes, 32,768 bytes) |
| Analog Inputs | 4 |
| A2D Converters | 12 bit |
| A2D Full Scale Input Voltage | Selectable Between 10-20 V |
| External Reference Clock Input Impedance | 100 Ω |
| External Reference Clock Frequency Range | 5 KHz – 20 MHz |
| External Reference Clock Signal | Sine or Square Wave |
| External Reference Clock Range | 15–70 mVpp |
| Sequencer Output Address Bus | 6-bit TTL |