System I/O addresses

The following table shows the location in I/O space of all directly I/O-accessible registers.

Address

 

Resource

0000h

- 000Fh

DMA Controller 1

 

 

 

0010h

- 001Fh

DMA Controller 1

 

 

 

 

0020h

-

0021h

Interrupt Controller 1

 

 

0022h - 0023h

 

 

 

 

 

0024h

-

0025h

Interrupt Controller 1

 

 

0026h - 0027h

 

 

 

 

 

0028h

-

0029h

Interrupt Controller 1

 

 

002Ah - 002Bh

 

 

 

002Ch - 002Dh

Interrupt Controller 1

 

 

002Eh - 002Fh

Super I/O Index and Data Ports

 

 

 

 

0030h

-

0031h

Interrupt Controller 1

 

 

0032h - 0033h

 

 

 

 

 

0034h

-

0035h

Interrupt Controller 1

 

 

0036h - 0037h

 

 

 

 

0038h

- 0039h

Interrupt Controller 1

 

 

003Ah - 003Bh

 

 

 

003Ch - 003Dh

Interrupt Controller 1

 

 

003Eh - 003Fh

 

 

 

0040h - 0043h

Programmable Timers

 

 

 

0044h

- 004Fh

 

 

 

0050h - 0053h

Programmable Timers

 

 

 

0054h

- 005Fh

 

 

 

0060h, 0064h

Keyboard Controller

 

 

 

 

0061h

 

 

NMI Status and Control Register

 

 

 

 

0063h

 

 

NMI Status and Control Register

 

 

 

 

0065h

 

 

NMI Status and Control Register

 

 

 

 

0067h

 

 

NMI Status and Control Register

 

 

 

 

System Specifications

135