The IBM PC/XT
Motherboard DIP Switch Settings
This chart was taken from A:1 Commputer Inc.
| Device | Switch's On / Off | Function |
|---|---|---|
| POST | 1 On | POST loop test |
| POST | 1 Off | Normal position |
| Coprocessor | 2 Off | Coprocessor installed |
| Coprocessor | 2 On | Coprocessor NOT installed |
| Memory | 3 On / 4 On | 256 KB RAM |
| Memory | 3 Off / 4 On | 512 KB RAM |
| Memory | 3 Off / 4 Off | 640 KB RAM |
| Video | 5 On / 6 On | EGA / VGA |
| Video | 5 Off / 6 Off | Monochrome |
| Video | 5 On / 6 Off | CGA 80x25 mode |
| Video | 5 Off / 6 On | CGA 40x25 mode |
| Floppy Drives | 7 On / 8 On | 1 Floppy Drive present |
| Floppy Drives | 7 Off / 8 On | 2 Floppy Drives present |
| Floppy Drives | 7 On / 8 Off | 3 Floppy Drives present |
| Floppy Drives | 7 Off / 8 Off | 4 Floppy Drives present |