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SYSTEM I/O PORTS

Add. range ( HEX )

Device

000-01FDMA controller
020-021Interrupt controller 1, master
022-023Chipset address
040-05FTimer
060-06FKeyboard controller
070-07FReal time clock ( NMI )
080-09FDMA page register
0A0-0BFInterrupt controller 2
0C0-0DFDMA controller
0F0Clear math co-processor
0F1Reset math co-processor
0F8-0FFMath co-processor
1F0-1F8Fixed disk
200-207Game I/O
278-27FParallel printer port 2 ( LPT3 )
290-297On-board hardware monitor
2F8-2FFSerial port 2
300-31FPrototype card
360-38FReserved
378-37FParallel printer port 1 ( LPT2 )
380-38FSDLC, bisynchronous 2
3A0-3AFbisynchronous 1
3B0-3BFMonochrome displayn and printer adapter ( LPT1 )
3C0-3CFReserved
3D0-3DFColor/graphics monitor adapter
3F0-3F7Diskette controller
3F8-3FFSerial port 1
443Watchdog timer

DMA CHANNEL ASSIGNMENTS
ChannelFunction
0

Available

1Available
2Floppy disk ( 8 bit transfer )
3Available
4Cascade for DMA controller 1
5Available
6Available
7Available


INTERRUPT ASSIGNMENTS

PriorityInterruptInterrupt source
1NMIParity error detected
2IRQ 0Interval timer
3IRQ 1Keyboard
-IRQ 2Interrupt from controller 2 ( cascade )
4IRQ 8Real-time clock
5IRQ 9Cascaded to INT 0A ( IRQ 2 )
6IRQ 10Available
7IRQ 11Available
8IRQ 12PS/2 mouse
9IRQ 13INT from co-processor
10IRQ 14Fixed disk controller
11IRQ 15Available
12IRQ 3Serial Comunication port 2
13IRQ 4Serial Comunication port 1
14IRQ 5Parellel port 2
15IRQ 6Diskette controller ( FDC )

16

IRQ 7Parallel port 1 ( print port )

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