HP e- 810E DMA channel controllers, interrupt controllers

4 BIOS overview

BIOS addresses

DMA channel controllers

Only “I/O-to-memory” and “memory-to-I/O” transfers are allowed. “I/O-to-I/O” and “memory-to-memory” transfers are disallowed by the hardware configuration.

The system controller supports seven DMA channels, each with a page register used to extend the addressing range of the channel to 16 MB. The following table summarizes how the DMA channels are allocated.

	DMA controller

Channel	Function

0	Free
1	Free if not used for parallel port in Setup
2	Free
3	Free if not used for parallel port in Setup
4	Used to cascade DMA channels 0-3
5	Free
6	Free
7	Free

interrupt controllers

The Interrupt Requests (IRQ) are numbered sequentially, starting with the master controller, and followed by the slave.

	IRQ	Interrupt Request Description
(Interrupt Vector)		Interrupt Request Description
(Interrupt Vector)

INTR

IRQ0		System Timer

IRQ1		Keyboard Controller

IRQ3		3 COM LAN

IRQ4		Used by serial post if enabled - CON1

IRQ5		Audio AC’97

Contents

product description - hp e-pc HP e-pc Page Contents 1 system overview 2 system features 3 serviceability 4 BIOS overview 5 drivers and software system overview hp e-pccomponents and technical features package features Front view rear connectors specifications physical characteristics both platforms power consumption acoustic noise emission environmental specifications Page system features hp e-pcsystem board layout system board hp e-pcPCI mapping architectural view main memory processors CMOS/password switch mass storage devices hard disk drives CD-ROM (CD/CD-ROM, CD-R, CD-RW)and DVD drives Features of the reclaimed by inserting a straightened paper-clipinto the small hole at the bottom of the door DVD region codes graphic interface specifications supported resolutions connectors audio network interface specifications network interface advanced features network interface diagnostics (not installed by default) connectors serviceability swapping parts returning your HP e-pcfor repair Page Page BIOS overview BIOS summary using the HP setup program auto-detectionand auto-configuration Page Page power saving and ergonometry soft power down safe off BIOS addresses system memory map hp I/O port map (I/O addresses used by the system) I/O Address Ports Function DMA channel controllers interrupt controllers Page order in which the POST tests are performed uncompressed INIT code checkpoints runtime code is uncompressed in F000 shadow ram Going to check pressing of <INS> , <END> key during power-on and Interrupt controllers 8254 timer test about to start About to start memory refresh test Memory Refresh line is toggling. Going to check 15us ON/OFF time To enable interrupts for diagnostics mode To initialize data to check memory wrap around at 0:0 memory size test memory memory command Command byte written, Global data init done. To check for lock-key Password checked. About to do programming before setup BIOS data area allocation to be done Setup options programming after CMOS setup about to start Soft error display complete. Going to set keyboard typematic rate Keyboard typematic rate set. To program memory wait states Going to enable parity/NMI at E000 control beep codes and error messages drivers and software drivers software operating systems software BIOS updates Page about this document hp e-pcbibliography Page Page CD-ROM •Introduction & HP e-pcOverview •Product Description •HP PC Technology