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AL700 / AL720 System Resources
I/O Address map
| Address |
Function |
| 0000 - 000F |
Controller |
| 0020 - 0021 |
Interrupt controller |
| 0040 - 0043 |
Timer 1 |
0060 |
Keyboard controller |
| 0061 |
Speaker |
| 0062, 0064, 0066 |
Keyboard controller command and status |
| 0070 - 0071 |
Real time clock & NMI mask |
| 0072 - 0073 |
Extended CMOS access |
| 0080 |
Diagnostic port |
| 0081 - 008F |
DMA page register |
| 00A0 - 00A1 |
Interrupt controller |
| 00B2 - 00B3 |
Power Management control |
| 00C0 - 00DF |
DMA controller |
| 00E4 - 00E7 |
Power control |
| 00F0 - 00FF |
Co-processor |
| 0170 - 0177 |
CD-ROM select |
| 01F0 - 01F7 |
HDD select |
| 0220 - 022F |
Audio (default) |
| 0240 - 024F |
Audio (default) |
| 0260 - 026F |
Audio (default) |
| 0280 - 028F |
Audio (default) |
| 0278 - 027B |
Parallel port (LPT2) |
| 02E8 - 02EF |
Serial port -4 (COM4) |
| 02F8 - 02FF |
IrDA port (default) |
| 0376 |
Select |
| 0378 - 037F |
Parallel port -1 |
| 03B0 - 03BB |
VDU controller |
| 03BC - 03BF |
Parallel port -3 (default) |
| 03C0 - 03DF |
Video controller |
| 03E8 - 03EF |
Serial port -31 |
| 03F0 - 03F5, 03F7 |
FDD controller |
| 03F6 |
HDD select |
| 03F8 - 03FF |
Serial port -1 (COM1) (default) |
| 040B |
DMA controller |
| 0480 - 048F |
DMA controller |
| 04D0 - 04D1 |
System control |
| 0778 - 077B |
Parallel port (Enhanced control port) |
| 0800 - 0807 |
Audio controller |
| 0CF8 - 0CFF |
PCI configuration register |
| 1000 - 101F |
USB control port |
| 2180 - 218F |
System control |
| 8000 - 803F |
System control |
| FCF0 - FCF7 |
PCI IDE controller |
| FCF8 - FCFF |
PCI IDE controller |
1 Or IrDA port
IRQ table
| Priority |
IRQ |
Interrupt type |
1 |
SMI |
Power management unit |
2 |
NMI |
NMI parity error / I/O channel error |
3 |
IRQ0 |
Timer / Counter 0 output |
4 |
IRQ1 |
IRQ1 keyboard |
4 |
IRQ2 |
IRQ2 reserved, cascade interrupt from slave PIC |
5 |
IRQ8 |
Real time clock |
6 |
IRQ9 |
PC card controller / USB |
7 |
IRQ10 |
Reserved |
8 |
IRQ11 |
Reserved |
9 |
IRQ12 |
Mouse |
10 |
IRQ13 |
Co-processor |
11 |
IRQ14 |
HDD controller |
12 |
IRQ15 |
Reserved 2 |
13 |
IRQ3 |
IrDA port |
14 |
IRQ4 |
Serial port -1 |
15 |
IRQ5 |
Audio |
16 |
IRQ6 |
FDD |
17 |
IRQ7 |
Parallel port -3 |
2 If a CD-ROM drive is fitted, it is
allocated IRQ15
DMA channel
| Channel |
Address |
Data width |
System
resource |
| 0 |
0087 |
8-bit |
Audio3 |
| 1 |
0083 |
8-bit |
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| 2 |
0081 |
8-bit |
FDD |
| 3 |
0082 |
8-bit |
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| 4 |
Cascade |
– |
Cascade |
| 5 |
008B |
16-bit |
Audio3 |
| 6 |
0089 |
16-bit |
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| 7 |
008A |
16-bit |
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3 The DMA channel of audio can be
changed in Setup
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