Port Address, Address Chip in Use | NEC 140Rc-4 instruction

IRQ and I/O Port Address C-3

I/O Port Address

The factory-set I/O port addresses for the server are assigned as follows:

Address	Chip in Use
00 - 1F	8-bit DMA control register
20 - 21	Master 8259 programming interface
2E - 2F	Configuration
40 - 43	8254 programming interface
60	Keyboard & mouse
61	NMI status register
64	Keyboard & mouse
70 - 71	NMI enable register/real-time clock
80 - 8F	16-bit DMA control register
A0 - A1	Slave 8259 programming interface
C0 - DF	DMA controller page register
E0 - E9	Base address register
F0	Register IRQ13
F1 - FF	Logical device configuration
170 - 177 or BAR2	EDMA2-compatible mode primary command block register
1F0 - 1F7 or BAR0	EDMA2-compatible mode secondary command block register
278 - 27F	(Parallel port 3)
2F8 - 2FF	Serial port B
BAR or 376	EDMA2-compatible mode secondary command block register
370 - 377	(Floppy disk drive 2), IDE 2
378 -37F	(Parallel port 2)
3B0 - 3BB	VGA
3BC - 3BE	Parallel port 1
3C0 - 3DF	VGA
3F6 or BAR1	EDMA2-compatible mode primary command block register
3F0 - 3F7	Floppy disk drive 1, IDE 1
3F8 - 3FF	Serial port A
40B	DMA1 expansion write mode register
4D0	Master 8259 ELCR programming
4D1	Slave 8259 ELCR programming
4D6	DMA2 expansion write mode register
580 - 58F	SMBus control
900-93F	PHPC1 register
940-97F	PHPC2 register
C00	PCI IRQ mapping index register
C01	PCI IRQ mapping data register
C14	PCI error status register
C49	Address & status control
C4A	Rise time counter control
C52	General register (GPMs)
C6C	ISA wait register