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Chapter 3 Hardware

24 Reference Manual CoreModule 920

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)

0061 NMI, Speaker control

0063 NMI Controller

0065 NMI Controller

0067 NMI Controller

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

0080 System reserved

0081-0083 DMA Page Registers

0084-0086 System reserved

0087 DMA Page Register

0088 System reserved

0089-008B DMA Page Registers

008C-008E System reserved

008F DMA Page Register

0090-0091 System reserved

0092 Fast A20 gate and CPU reset

0093-009F System reserved

00A0-00A1 Slave Interrupt Controller

00A2-00BF System reserved

00C0-00DF Slave DMA Controller #2

00E0-00EF System reserved

00F0-00FF Math Coprocessor

01F0-01F7 SATA Controller

02F8-02FF Serial Port 2 (COM2)

03B0-03BB Video (monochrome)

03C0-03DF Video (VGA)

03F8-03FF Serial Port 1 (COM1)

0400-041F SMBus Configuration Ports

0500-053F PCH GPIO Configuration Ports

0800-087F PCH Power Management Ports

0CF8-0CFF PCI bus Configuration Address and Data

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 63 64

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