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M440LX Server System Product Guide
159
I/O Addresses and Resources
The I/O map in the following table shows the location in I/O space of all
directly I/O accessible registers.
Address Resource
0000h–000Fh DMA Controller 1
0020h–0021h Interrupt Controller 1
002Eh–002Fh Super I/O Index and Data Ports
0040h–0043h Programmable Timer
0060h, 0064h Keyboard Controller
0061h NMI Status & Control Register
0070h NMI Mask (bit 7) & RTC Address (bits 6:0)
0071h Real Time Clock (RTC)
0080h–0081h BIOS Timer
0080h–008Fh DMA Low Page Register
0092h System Control Port A (PC-AT
†
control Port)
00A0h–00BFh Interrupt Controller 2
00C0h–00DFh DMA Controller 2
00F0h Clear NPX error
00F8h–00FFh x87 Numeric Coprocessor
0170h–0177h Secondary Fixed Disk Controller (IDE)
01F0h–01F7h Primary Fixed Disk Controller (IDE)
0200h–0207h Game I/O Port
0220h–022Fh Serial Port A
0238h–023Fh Serial Port B
0278h–027Fh Parallel Port 3
02E8h–02EFh Serial Port B
02F8h–02FFh Serial Port B
0338h–033Fh Serial Port B
0370h–0375h Secondary Floppy
0378h–037Fh Parallel Port 2
03B4h–03BAh Monochrome Display Port
03BCh–03BFh Parallel Port 1 (Primary)
Continued