
Electronic specifications
Electronic specificationsMemory map
Address Range (hex) | Amount | Function |
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0 to 07FFFFh | 640 KB | DOS region, base system memory |
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0A0000h to 0BFFFFh | 128 KB | Video or SMM memory |
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0C0000h and 0DFFFFh | 128 KB | Expansion card BIOS and buffer area |
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0E0000h to 0FFFFFh | 128 KB | System BIOS |
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0E0000h to 0EFFFFh | 2 MB | Extended system BIOS |
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FC000000h to FFFFFFFFh | 64 MB | PCI memory space |
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Interrupts
The following table reflects a typical configuration, but you can change these interrupts. Use this information to determine how to program each interrupt. The actual interrupt map is defined using configuration registers in the
Interrupt | Description |
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IRQ0 | Timer/counter, HPET #0 in legacy |
| replacement Mode. In APIC mode, |
| cascade from 8259 controller 1 |
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IRQ1 | Keyboard controller |
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IRQ2 | Slave controller INTR output. In APIC |
| mode Timer/counter, HPET #0 |
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IRQ3 | Serial port A |
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IRQ4 | Serial port B |
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IRQ5 | Parallel port |
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IRQ6 | Diskette controller |
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IRQ8 | |
| replacement mode |
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IRQ9 | Generic, Option for SCI |
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