HP C727US, C721TU, C725BR, C750T System I/O address specifications, Specifications, I/O address hex

System I/O address specifications

I/O address (hex)		System function (shipping configuration)
000	- 00F	DMA controller no. 1
010	- 01F	Unused
020	- 021	Interrupt controller no. 1
022	- 024	Opti chipset configuration registers
025	- 03F	Unused
02E - 02F		87334 “Super I/O” configuration for CPU
040	- 05F	Counter/timer registers
044	- 05F	Unused
060		Keyboard controller
061		Port B
062	- 063	Unused
064		Keyboard controller
065	- 06F	Unused
070	- 071	NMI enable/RTC
072	- 07F	Unused
080	- 08F	DMA page registers
090	- 091	Unused
092		Port A
093	- 09F	Unused
0A0 - 0A1		Interrupt controller no. 2
I/O Address (hex)		System function (shipping configuration)
0A2 - 0BF		Unused
0C0 - 0DF		DMA controller no. 2
0E0 - 0EF		Unused
0F0 - 0F1		Coprocessor busy clear/reset
0F2 - 0FF		Unused
100	- 16F	Unused
170	- 177	Secondary fixed disk controller
178	- 1EF	Unused
1F0 - 1F7		Primary fixed disk controller
1F8 - 200		Unused
201		JoyStick (decoded in ESS1688)
202	- 21F	Unused

94 Chapter 6 Specifications