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Chapter 3 Hardware

22 Reference Manual CoreModule 435

Memory Map

The following table provides the common PC/AT memory allocations. These are DOS-level addresses. The

OS typically hides these physical addresses by way of memory management. Memory below 000500h is

used by the BIOS.

I/O Address Map

Table 3-4 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. Memory Map - Vortex 86SX/DX Processor

Base Address Function

00000000h - 0009FFFFh Conventional Memory

000A0000h - 000AFFFFh Graphics Memory

000B0000h - 000B7FFFh Mono Text Memory

000B8000h - 000BFFFFh Color Text Memory

000C0000h - 000C7FFFh Standard Video BIOS

000D0000h - 000DFFFFh Reserved for Extended BIOS

000E0000h - 000EFFFFh Extended System BIOS Area

000F0000h - 000FFFFFh System BIOS Area (Storage and RAM Shadowing)

00100000h

- Top of

DRAM

Main DRAM Range

FFFC0000h -

[for SX

processor]

FFE00000h -

[for DX

processor]

FFFFFFFFh System Flash

Table 3-4. I/O Address Map

Address (hex) Subsystem

0000-000F Primary DMA Controller (#1)

0020-0021 Master Interrupt Controller (#1)

0040-0043 Programmable Interrupt Timer (Clock/Timer)

0060 Keyboard Controller

0061 ISA Standard Port B

0063 ISA Standard Port B alias

0064 Keyboard Controller

0065 ISA Standard Port B alias

0067 ISA Standard Port B alias

0069 ISA Standard Port B alias

006B ISA Standard Port B alias

006D ISA Standard Port B alias

006F ISA Standard Port B alias

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 57 58

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