APPENDIX A: Server Specifications
Electronic specifications
Memory map
| Address Range (hex) | Amount | Function |
|
|
|
| 0 to 07FFFFh | 640 KB | DOS region, base system memory |
|
|
|
| 0A0000h to 0BFFFFh | 128 KB | Video or SMM memory |
|
|
|
| 0C0000h and 0DFFFFh | 128 KB | Expansion card BIOS and buffer area |
|
|
|
| 0E0000h to 0FFFFFh | 128 KB | System BIOS |
|
|
|
| 0E0000h to 0EFFFFh | 2 MB | Extended system BIOS |
|
|
|
| FC000000h to FFFFFFFFh | 64 MB | PCI memory space |
|
|
|
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
Important
If you disable an IDE controller to free the interrupt for that controller, you must physically unplug the IDE cable from the system board. Simply disabling the drive by configuring the BIOS does not make the interrupt available.
I
| Interrupt | Description |
|
|
| IRQ0 | Timer/counter, HPET #0 in legacy |
| replacement Mode. In APIC mode, cascade |
| from 8259 controller 1 |
| IRQ1 | Keyboard controller |
|
|
| IRQ2 | Slave controller INTR output. In APIC mode |
| Timer/counter, HPET #0 |
| IRQ3 | Serial port A |
|
|
| IRQ4 | Serial port B |
|
|
| IRQ5 | Parallel port |
|
|
| IRQ6 | Diskette controller |
|
|
| IRQ8 | |
| replacement mode |
|
|
| IRQ9 | Generic, Option for SCI |
|
|
| IRQ10 | Generic, Option for SCI |
|
|
| IRQ11 | HPET #2, option for SCSI, TCO |
|
|
| IRQ12 | Mouse controller |
|
|
| IRQ13 | System interrupt/FERR |
|
|
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