User manual

Chapter 3 BIOS Setup

- 42 - EC0-1815V2NAR

 IO Port Address

Only 16 IO address lines are designed for X86, from 0 ~ 0FFFFh; there is 64K for the

system I/O address space. In traditional ISA connector, only the foregoing 1024 (0000

~ 03FFh) are adopted while the ports above 0400h are adopted by PCI and EISA

connectors. Each peripheral will occupy portion of the space. The table below shows

parts of the I/O connectors used in X86 platform.

Address Device Description

000h - 01Fh DMA Controller

00h – CF7h PCI bus

010h - 01Fh Motherboard Resource

020h - 021h Programmable Interrupt Controller

022h - 03Fh Motherboard Resource

024h - 025h Programmable Interrupt Controller

028h - 029h Programmable Interrupt Controller

02Ch – 02Dh Programmable Interrupt Controller

02Eh - 02Fh Motherboard Resource

030h - 031h Programmable Interrupt Controller

034h - 035h Programmable Interrupt Controller

038h – 039h Programmable Interrupt Controller

03Ch – 03Dh Programmable Interrupt Controller

040h - 043h System Timer

044h - 05Fh Motherboard Resource

04Eh - 04Fh Motherboard Resource

050h - 053h System Timer

060h Standard 101/102 Key or Microsoft Natural PS/2 Keyboard

061h Motherboard Resource