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Note: The following table is only valid for IOMD-based pre-HAL machines. For machines with a HAL (even a HAL running on IOMD), programmers should make no assumption about device numbers following any fixed scheme. Instead, the appropriate OS calls or hardware-specific documentation should be used to determine the correct device numbers.
# | Meaning |
---|---|
0 | Printer interrupt from 82C710/1 |
1 | Unused (was Low battery warning on IOC) |
2 | Floppy disc indexer |
3 | VSync Pulse |
4 | Power on reset |
5 | Timer 0 |
6 | Timer 1 |
7 | FIQ downgrade – reserved for the current owner of FIQ |
8 | Expansion card FIQ downgrade; this should normally be masked off |
9 | IDE hard disc interrupt (was Sound system buffer change on IOC) |
10 | Serial port interrupt from 82C710/1 also mapped to FIQ device 4 |
11 | Network interrupt |
12 | Floppy disc interrupt |
13 | Expansion card interrupt |
14 | Keyboard serial transmit register empty |
15 | Keyboard serial receive register full |
16 | DMA channel 0 |
17 | DMA channel 1 |
18 | DMA channel 2 |
19 | DMA channel 3 |
20 | DMA sound channel 0 |
21 | DMA sound channel 1 |
22 | ARM 7500 mouse port receive register full |
23 | ARM 7500 mouse port transmit register empty |
24 | ARM 7500 joystick A-to-D completion |
25 | ARM 7500 event 1 |
26 | ARM 7500 event 2 |
PCI device numbers are allocated dynamically – see PCI_ReadInfo (bit 11).