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Chapter 3 Hardware
24 Reference Manual LittleBoard 550
Table 3-2. Memory Map
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
000F0000h - 000FFFFFh System BIOS Area (Storage and RAM Shadowing)
00100000h - 04000000h
Extended Memory (If onboard VGA is enabled, then the amount
of memory assigned is subtracted from extended memory)
FFF80000h - FFFFFFFFh System Flash
I/O Address Map
Table 3-3 shows the I/O address map.
Table 3-3. I/O Address Map
Address (hex) Subsystem
000-00F Primary DMA Controller
020-021 Master interrupt Controller
040-043 Programmable Interrupt Timer (Clock/Timer)
060-06F Keyboard Controller
070-07F CMOS RAM, NMI Mask Reg, RT Clock
080-09F DMA Page Registers
092 Fast A20 gate and CPU reset
094 Motherboard enable
102 Video subsystem register
0A0-0BF Slave Interrupt Controller
0C0-0DF Slave DMA Controller #2
0F0-0FF Math Coprocessor
170-177 Secondary IDE Hard Disk Controller
1F0-1F8 Primary IDE Hard Disk Controller
278-27F Parallel Printer
2E8-2FF Serial Port 4 (COM4)
2F8-2FF Serial Port 2 (COM2)
378-37F Parallel port (Standard and EPP)
3C0-3DF VGA
3E8-3EF Serial Port 3 (COM3)
3F0-3F7 Floppy Disk Controller
3F8-3FF Serial Port 1 (COM1)
778-77A Parallel Port (ECP Extensions) (Port 378+400)
CF8-CFF PCI bus Configuration Address and Data