I/O Map
The following table lists the main I/O definitions of the Oscom Nano.
| Q |
- Sound on/off - Cassette out |
| EF1 | CDP 1864 display: display status |
| EF2 | Cassette In |
| EF3 | Keyboard pressed |
| EF4 | Monitor button pressed |
| OUT 2 | Key latch |
| OUT 4 |
- Address latch: after any OUT 4, ROM at address @0000 swapped for RAM - Any value will set the tone frequency |
| INP 1 | CDP 1864 display: display on |
| INP 4 | CDP 1864 display: display off |