HP MAY21J8412 Table, System I/O Map

System Support

	Table 4-8
	System I/O Map
I/O Port	Function
0000..001Fh	DMA Controller 1
0020..002Dh	Interrupt Controller 1
002E, 002Fh	Index, Data Ports to SIO Controller (primary)
0030..003Dh	Interrupt Controller
0040..0042h	Timer 1
004E, 004Fh	Index, Data Ports to SIO Controller (secondary)
0050..0052h	Timer / Counter
0060..0067h	Microcontroller, NMI Controller (alternating addresses)
0070..0077h	RTC Controller
0080..0091h	DMA Controller
0092h	Port A, Fast A20/Reset Generator
0093..009Fh	DMA Controller
00A0..00B1h	Interrupt Controller 2
00B2h, 00B3h	APM Control/Status Ports
00B4..00BDh	Interrupt Controller
00C0..00DFh	DMA Controller 2
00F0h	Coprocessor error register
0170..0177h	IDE Controller 2 (active only if standard I/O space is enabled for secondary controller)
01F0..01F7h	IDE Controller 1 (active only if standard I/O space is enabled for primary controller)
0278..027Fh	Parallel Port (LPT2)
02E8..02EFh	Serial Port (COM4)
02F8..02FFh	Serial Port (COM2)
0370..0377h	Diskette Drive Controller Secondary Address
0376h	IDE Controller 2 (active only if standard I/O space is enabled for primary drive)
0378..037Fh	Parallel Port (LPT1)
03B0..03DFh	Graphics Controller
03BC..03BEh	Parallel Port (LPT3)
03E8..03EFh	Serial Port (COM3)
03F0..03F5h	Diskette Drive Controller Primary Addresses
03F6h	IDE Controller 1 (active only if standard I/O space is enabled for sec. drive)
03F8..03FFh	Serial Port (COM1)
04D0, 04D1h	Interrupt Controller
0678..067Fh	Parallel Port (LPT2)
0778..077Fh	Parallel Port (LPT1)
07BC..07BEh	Parallel Port (LPT3)
0CF8h	PCI Configuration Address (dword access only )
0CF9h	Reset Control Register
0CFCh	PCI Configuration Data (byte, word, or dword access)

NOTE:

Assume unmarked gaps are unused, reserved, or used by functions that employ variable I/O address mapping. Some ranges may include reserved addresses.

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