PC I/O Port Address Map

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IBM PC / XT / AT
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chuckphd53
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PC I/O Port Address Map

Post by chuckphd53 »

Here is a quick reference of the I/O port map, may come in handy.


PC I/O port address map
Range (hex) Function
000 - 1FF Base system
200 Reserved
201 Game control
202 - 277 Reserved
278 - 27F LPT2: (2nd printer port)
280 - 2F7 Reserved
2F8 - 2FF COM2:
300 - 377 Reserved
378 - 37F LPT1: (1st printer port)
380 - 3AF Reserved
3B0 - 3BF Mono Display/Print adapter
3C0 - 3CF Reserved
3D0 - 3DF Color/Graphics
3E0 - 3EF Reserved
3F0 - 3F7 Floppy disk drive
3F8 - 3FF COM1:
“I never commit to memory anything that can easily be looked up in a book.” (AE)
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