HP Kayak XU 04xx HP Kayak XU PC Workstation Technical Reference Manual Hardwar - Page 63

4 HP BIOS BIOS Addresses HP I/O Port Map (I/O Addresses Used by the System1) Peripheral devices, accessory devices and system controllers are accessed via the system I/O space, which is not located in system memory space. The 64 KB of addressable I/O space comprises 8-bit and 16-bit registers (called I/O ports) located in the various system components. When installing an accessory board, ensure that the I/O address space selected is in the free area of the space reserved for accessory boards (100h to 3FFh). Although the Setup program can be used to change some of the settings, the following address map is not completely BIOS dependent, but is determined partly by the operating system. Note that some of the I/O addresses are allocated dynamically. I/O Address Ports 0000h - 000Fh 0020h - 0021h 002E - 002F 0040h - 0043h 0060h, 0064h 0061h 0070h 0070 - 0071h 0080h 0081h - 0083h, 008Fh 0092h 0096h - 0097h 00A0h - 00A1h 00C0h - 00DFh 00F0h - 00FFh 0130 - 013F 0170h - 0177h 01F0h - 01F7h 0200h - 0207h 0220h - 0232h 0278h - 027Fh 02E8h - 02EFh 02F8h - 02FFh 0330h - 0331h 0372h - 0377h Function DMA controller 1 Master interrupt controller NS317 Configuration registers Timer 1 Keyboard controller Port B (speaker, NMI status and control) Bit 7: NMI mask register RTC and CMOS data Manufacturing port (POST card) DMA low page register PS/2 reset and Fast A20 Little Ben Slave interrupt controller DMA controller 2 Co-processor error AD1816 sound system Free (IDE secondary channel) IDE primary channel AD1816 Joystick port AD1816 Soundblaster Parallel port 2 (LPT 2) Serial port 4 (COM4) Serial port 2 (COM2) AD1816 MIDI Free (secondary flexible disk drive controller) 1. If configured. 55