I/O Map
The following table lists the main I/O definitions of the CDS II.
| Q |
Video Terminal: serial output |
| EF1 | Printer ready |
| EF4 | VT, serial input |
| OUT 1 | Set I/O group I/O group 1: VT (Video Terminal), Printer & Floppy Disk |
| OUT 4 | Group 1: Write to selected floppy disk port |
| OUT 5 | Group 1: Select floppy disk port |
| OUT 6 | Group 1: Printer data out |
| INP 1 | Read I/O group |
| INP 6 | Group 1: Read floppy disk port |
The following table lists the main I/O definitions of the CDS III.
| EF1 | Printer ready |
| OUT 1 | Set I/O group I/O group 1: VT (Video Terminal via UART1854), Printer & Floppy Disk |
| OUT 2 | Group 1: Write UART1854 register |
| OUT 3 | Group 1: Write UART1854 control |
| OUT 4 | Group 1: Write to selected floppy disk port |
| OUT 5 | Group 1: Select floppy disk port |
| OUT 6 | Group 1: Printer data out |
| INP 1 | Read I/O group |
| INP 2 | Group 1: Read UART1854 register |
| INP 3 | Group 1: Read UART1854 status |
| INP 6 | Group 1: Read floppy disk port |