B.24 DMA Channel Assignments
Table B.25: DMA Channel Assignments
Channel | Function |
|
|
0 | Available |
1 | Available |
2 | Floppy disk |
3 | Available |
4 | Cascade for DMA controller 1 |
5 | Available |
6 | Available |
7 | Available |
B.25 Interrupt Assignments
Table B.26: Interrupt Assignments
Priority | Interrupt# | Interrupt source |
|
|
|
1 | NMI | Parity error detected |
2 | IRQ0 | Interval timer |
3 | IRQ1 | Keyboard |
- | IRQ2 | Interrupt from controller 2 (cascade) |
4 | IRQ8 | |
5 | IRQ9 | Cascaded to INT 0A (IRQ 2) |
6 | IRQ10 | Serial communication port 3/5 |
7 | IRQ11 | Serial communication port 4/6 |
8 | IRQ12 | PS/2 mouse |
9 | IRQ13 | INT from |
10 | IRQ14 | Primary IDE Channel |
11 | IRQ15 | Secondary IDE Channel |
12 | IRQ3 | Serial communication port 2 |
13 | IRQ4 | Serial communication port 1 |
14 | IRQ5 | Available |
15 | IRQ6 | Available |
16 | IRQ7 | Parallel port 1 (print port) |
B.26 1st MB Memory Map
Table B.27: 1st MB Memory Map
Addr. range (Hex) | Device |
|
|
E0000h - FFFFFh | BIOS |
CC000h - DFFFFh | Unused |
C0000h - CBFFFh | VGA BIOS |
A0000h - BFFFFh | Video Memory |
00000h - 9FFFFh | Base memory |
82 |
