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Chapter 3 Hardware

22 Reference Manual CoreModule 720

I/O Address Map

Table 3-3 shows the I/O address map. These are DOS-level addresses. The OS typically hides these physical

addresses by way of memory management.

Table 3-3. I/O Address Map

Address (hex) Subsystem

0000-00F Primary DMA Controller

0020-0021 Master Interrupt Controller

0040-0043 Programmable Interrupt Timer (Clock/Timer)

0060-006F Keyboard Controller

0070-007F CMOS RAM, NMI Mask Reg, RT Clock

0080-009F DMA Page Registers

00A0-00BF Slave Interrupt Controller

00C0-00DF Slave DMA Controller #2

00F0-00FF Math Coprocessor

03B0-03BB Video (monochrome)

03C0-03DF VGA

0400-041F SMBus Configuration Ports

0500-053F PCH GPIO Configuration Ports

0800-087F PCH Power Management Ports

0A79h ISA PnP Ports

0CF8-0CFF PCI bus Configuration Address and Data

NOTE 0A79h is the ISA PnP port used by the BIOS and an OS that supports this feature to

recognize ISA PnP (Plug and Play) cards.

The Intel I/O hub PCH EG20T does not support ISA DMA.

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