![background image](http://html.mh-extra.com/html/nec/express-5800-120lg/express-5800-120lg_service-manual_251153181.webp)
IRQ and I/O Port Addresses 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 2
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 1
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
Summary of Contents for Express 5800/120Lg
Page 1: ... S e r v i c e G u i d e EXPRESS5800 120Lg ...
Page 2: ......
Page 4: ......
Page 10: ......
Page 73: ...Disassembly and Reassembly 4 7 Figure 4 2 Installing the Left Hand Side Access Panel ...
Page 132: ......
Page 161: ...6 Illustrated Parts Breakdown Exploded View Field Replaceable Units ...
Page 168: ......
Page 169: ...A Specifications System Specifications ...
Page 179: ...C IRQ and I O Port Addresses Interrupt Requests PIRQ and PCI Device ...
Page 188: ......
Page 198: ......
Page 203: ...xx ...
Page 204: ... 456 01673 000 ...