HP Workstation x2000 hp workstation x2000 - Technical Reference and Troublesho - Page 92

HP BIOS BIOS Addresses HP I/O Port Map (I/O Addresses Used by the System1) You access peripheral devices, accessory devices, and system controllers through the system I/O space, which isn't located in system memory space. The 64KB of addressable I/O space comprises 8-bit and 16-bit registers (called I/O ports) located in the various system components. When you install an accessory board, ensure that the selected I/O address space is in the free area of the space reserved for accessory boards (100h to 3FFh). Default Values for I/O Address Ports 0000 - 0CF7 0020 - 0021 002E - 002F 0040 - 0043 0060, 0064 0061 0070 0070 - 0071 0080 0081 - 0083, 008F 0092 00A0 - 00A1 00C0 - 00DF 00F0 - 00FF 0170 - 0177 01F0 - 01F7 0278 - 027F 02E8 - 02EF 02F8 - 02FF 0372 - 0377 0378 - 037F 03B0 - 03DF 03E8 - 03EF 03F0 - 03F5 03F6 Function DMA controller 1 Master interrupt controller (8259) Super I/O Timer 1 Keyboard controller (reset, slow A20) Port B (speaker, NMI status, and control) Bit 7: NMI mask register RTC and CMOS Manufacturing port (POST card) DMA low page register PS/2 reset and Fast A20 Slave interrupt controller DMA controller 2 Coprocessor error Free (IDE secondary channel) IDE primary channel LPT 2 Serial port 4 (COM4) Serial port 2 (COM2) Free (IDE secondary channel, secondary floppy disk drive) LPT1 VGA COM3 Floppy disk drive controller IDE primary channel 1. If configured. 92 Chapter 3