Compaq CQ20 System I/O address specifications, Address hex System function shipping configuration

Specifications

System I/O address specifications

I/O address (hex)	System function (shipping configuration)
000 - 01F	DMA controller
020 - 021	Program interrupt controller
024 - 025	Program interrupt Controller
028 - 029	Program interrupt Controller
02C - 03D	Program interrupt Controller
02E - 02F	Motherboard Resource
030 - 031	Program interrupt Controller
034 - 035	Program interrupt Controller
038 - 039	Program interrupt Controller
03C- 03D	Program interrupt Controller
040 - 043	System Timer
04E-04F	Motherboard Resource
050-053	System Timer
060	Standard 101-/102-Key or Microsoft. Natural Keyboard
061	Motherboard Resource
062	Microsoft ACPI-Compliant Embedded Controller
063	Motherboard Resource
064	Standard 101-/102-Key or Microsoft. Natural Keyboard
065	Motherboard resources
066	Microsoft ACPI-Compliant Embedded Controller
067	Motherboard resources
070	Motherboard resources
070-077	System CMOS/real time clock
080	Motherboard resources
081-091	Direct memory access controller
092	Motherboard resources
093-09F	Direct memory access controller
0A0-0A1	Program interrupt Controller
0A4-0A5	Program interrupt Controller
0A8-0A9	Program interrupt Controller
0AC-0AD	Program interrupt Controller
0B0-0B1	Program interrupt Controller
0B2-0B3	Motherboard resources
0B4- 0B5	Program interrupt Controller
0B8-0B9	Program interrupt Controller
0BC- 0BD	Program interrupt Controller

(Continued)

6–6 Maintenance and Service Guide