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Chapter 3 |
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| Hardware | ||
Table |
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| Base Address | Function |
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| 00000000h | - | 0009FFFFh | Conventional Memory |
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| 000A0000h | - | 000AFFFFh | Graphics Memory |
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| 000B0000h | - | 000B7FFFh | Mono Text Memory |
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| 000B8000h | - | 000BFFFFh | Color Text Memory |
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| 000C0000h | - | 000C7FFFh | Standard Video BIOS |
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| 000F0000h | - | 000FFFFFh | System BIOS Area (Storage and RAM Shadowing) |
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| 00100000h | - | 04000000h | Extended Memory (If onboard VGA is enabled, then the amount |
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| of memory assigned is subtracted from extended memory) |
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| FFF80000h | - | FFFFFFFFh | System Flash |
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I/O Address Map
Table
Table
Address (hex) | Subsystem |
Primary DMA Controller | |
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Master interrupt Controller | |
Programmable Interrupt Timer (Clock/Timer) | |
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Keyboard Controller | |
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CMOS RAM, NMI Mask Reg, RT Clock | |
DMA Page Registers | |
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092 | Fast A20 gate and CPU reset |
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094 | Motherboard enable |
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102 | Video subsystem register |
Slave Interrupt Controller | |
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Slave DMA Controller #2 | |
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Math Coprocessor | |
Secondary IDE Hard Disk Controller | |
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Primary IDE Hard Disk Controller | |
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Parallel Printer | |
Serial Port 4 (COM4) | |
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Serial Port 2 (COM2) | |
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Parallel port (Standard and EPP) | |
VGA | |
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Serial Port 3 (COM3) | |
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Floppy Disk Controller | |
Serial Port 1 (COM1) | |
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Parallel Port (ECP Extensions) (Port 378+400) | |
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| PCI bus Configuration Address and Data |
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24 | Reference Manual | LittleBoard 550 |