I/O Map
The following table lists the main I/O definitions of the MS2000.
| Q |
Video Terminal: serial output |
| EF1 | Printer ready |
| EF2 | Cassette in |
| EF3 | uPD765 Interrupt |
| EF4 | VT, serial input |
| OUT 1 |
Set I/O group I/O group 1: VT (Video Terminal) & Printer I/O group 2: Tape I/O group 8: 18S651 and uPD765 |
| OUT 2 | Group 1: VT Load transmitter |
| OUT 3 | Group 1: VT Load control |
| OUT 4 |
Group 2: Tape motor Group 8: DMA control |
| OUT 5 |
Group 2: Cassette out Group 8: uPD765 command register |
| OUT 6 | Group 1: Printer data out |
| OUT 7 | Group 8: DMA count |
| INP 1 | Read I/O group |
| INP 2 | Group 1: VT Read receiver |
| INP 3 | Group 1: VT Read status |
| INP 4 | Group 8: uPD765 status |
| INP 5 | Group 8: uPD765 command register |