I/O Map
The following table lists the main I/O definitions of the Telmac 2000.
| Q |
- Sound on/off - Cassette out |
| EF1 | CDP 1861 display: display status |
| EF2 | Cassette In |
| EF3 | Keyboard pressed |
| OUT 1 | CDP 1864 display: step background colour and display on |
| OUT 2 | Key latch |
| OUT 4 |
Address, colour and tone latch: - value != 1: RAM will be mapped at address @0000 instead of ROM - value = 1: Set colour latch; address @8000-@83FF will write to colour RAM - Any value will set the tone frequency |
| INP 1 | CDP 1864 display: display on |
| INP 4 | CDP 1864 display: display off |