Path: utzoo!yunexus!geac!syntron!jtsv16!uunet!ncrlnk!ncrcae!hubcap!gatech!bloom-beacon!bu-cs!mirror!mguyott
From: mguyott@mirror.TMC.COM (Marc Guyott)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Need Port Listing for IBM-PC/XT and IBM-PC/AT
Keywords: ibm-pc xt at port listing dma interrupt danke
Message-ID: <18711@mirror.TMC.COM>
Date: 12 Oct 88 15:25:00 GMT
Article-I.D.: mirror.18711
References: <186@spt.entity.com>
Reply-To: mguyott@prism.TMC.COM (Marc Guyott)
Organization: Mirror Systems, Cambridge Mass.
Lines: 47

In article <186@spt.entity.com> mdc@spt.entity.com (Marty Connor) writes:
>
>...
>Does anyone have or know where I can find a listing of the ports on an
>IBM-PC? 
>

The following is from "The Peter Norton Programmer's Guide to the IBM PC":

Figure 2-9.  The ports and port addresses used in the PCjr, the PC/XT, and
the AT computers.

Description                                        Range
                                     PCjr         PC/XT           AT
DMA Controller (8237)                n/a         000-00F        000-01F
Interrupt controller (8259)        020-027       020-021        020-03F
Timer (8253;8254.2 in AT)          040-047       040-043        040-05F
PPI (8255)                         060-067       060-063          n/a
Keyboard (8042)                      n/a           n/a          060-06F
DMA page register (74LS612)          n/a         080-083        080-09F
NMI mask register                  0A0-0A7         0A           070-07F
Interrupt controller 2 (8259)        n/a           n/a          0A0-0BF
Sound generator (SN76496N)         0C0-0C7         n/a            n/a
DMA controller 2 (8237)              n/a           n/a          0C0-0DF
Clear/reset math coprocessor         n/a           n/a          0F0-0F1
Math coprocessor                     n/a           n/a          0F8-0FF
Joystick (game controller)         200-207       200-20F        200-207
Expansion unit                       n/a         210-217          n/a
Parallel printer (secondary)         n/a           n/a          278-27F
Serial port (primary)              2F8-2FF       3F8-3FF        3F8-3FF
Serial port (secondary)              n/a         2F8-2FF        2F8-2FF
Prototype card                       n/a         300-31F        300-31F
Fixed disk                           n/a         320-32F        1F0-1F8
Parallel printer (primary)           n/a         378-37F        378-37F
SDLC (secondary BISYNC in AT only)   n/a         380-38F        380-38F
BISYNC (primary)                     n/a           n/a          3A0-3AF
Monochrome adapter/printer           n/a         3B0-3BF        3B0-3BF
Color/graphics adapter               n/a         3D0-3DF        3D0-3DF
Diskette controller                0F0-0FF       3F0-3F7        3F0-3F7

----
       ... I never saw the morning until I stayed up all night ...
                               Tom Waits

Marc Guyott                                         mguyott@mirror.TMC.COM
{mit-eddie, pyramid, harvard!wjh12, xait, datacube}!mirror!mguyott
Mirror Systems	Cambridge, MA  02140                617/661-0777