4 Summary of the HP/Phoenix BIOS
HP/Phoenix BIOS (BIOS version: GX.07.xx)
The following table summarizes how the DMA channels are allocated.
First DMA controller (used for
Channel | Function |
0Available
1Available or ECP mode for parallel port
2Flexible disk I/O
3Available or ECP mode for parallel port
Second DMA controller (used for
Channel | Function |
|
|
4 | Cascade from first DMA controller |
|
|
Available | |
|
|
Available | |
|
|
Interrupt Controllers
(BIOS version: GX.07.xx)
The system has two 8259A compatible interrupt controllers. They are arranged as a master interrupt controller and a slave that is cascaded through the master.
The following table shows how the master and slave controllers are connected. As the HP Vectra 500 Series incorporates the Plug and Play mode, some of the IRQ settings indicated in the following table could be different. This table should be used as a guideline only. The Interrupt Requests (IRQ) are numbered sequentially, starting with the master controller, and followed by the slave.
IRQ (Interrupt Vector) | Interrupt Request Description | |
|
|
|
IRQ0(08h) |
| System timer |
|
|
|
IRQ1(09h) |
| Keyboard controller |
|
|
|
IRQ2(0Ah) | Slave IRQ | Cascade connection from INTC2 (Interrupt Controller 2) |
|
|
|
| IRQ8(70h) | Real time clock |
|
|
|
| IRQ9(71h) | Available for PCI expansion cards, if not used by ISA boards |
|
|
|
| IRQ10(72h) | Available for PCI expansion cards, if not used by ISA boards |
|
|
|
| IRQ11(73h) | Available for PCI expansion cards, if not used by ISA boards |
|
|
|
| IRQ12(74h) | Mouse |
|
|
|
| IRQ13(75h) | Pentium |
|
|
|
| IRQ14(76h) | Primary channel of IDE controller |
|
|
|
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