Port Addresses

DMA controller (8237A-5)                            000-01F          
                                                                     

Interrupt controller (8259A)                        020-03F          
                                                                     

Timer (8254)                                        040-05F          
                                                                     

Keyboard                                            060-06F          
                                                                     

DMA page register (74LS612)                         080-08F          
                                                                     

NMI register                                        070-07F          
                                                                     

Interrupt controller 2 (8259A)                      0A0-0BF          
                                                                     

DMA controller 2 (8237A-5)                          0C0-0DF          
                                                                     

Clear/reset math coprocessor                        0F0-0F1          
                                                                     

Math coprocessor                                    0F8-0FF          
                                                                     

Fixed disk                                          1F0-1F8          
                                                                     

Game adapter                                        200-207          
                                                                     

Parallel printer (secondary)                        278-27F          
                                                                     

Serial port (primary)                               3F8-3FF          
                                                                     

Serial port (secondary)                             2F8-2FF          
                                                                     

Prototype card                                      300-31F          
                                                                     

Parallel printer (primary)                          378-37F          
                                                                     

SDLC (secondary bisynchronous communications  AT    380-38F          
only)                                                                 
                                                                     

Bisynchronous communications (primary)              3A0-3AF          
                                                                     

Monochrome adapter                                  3B0-3BF          
                                                                     

Color/graphics adapter                              3D0-3DF          
                                                                     

Diskette controller                                 3F0-3F7