38
1
st
MB Memory Address Map
Memory address
Description
00000-9FFFF
System memory
A0000-BFFFF
VGA buffer
C0000-CBFFF
VGA BIOS
* D6000-D7FFF
DOC 2000
E0000–FFFFF
System BIOS
1000000-
Extend BIOS
*Default Setting
IRQ Mapping Chart
IRQ0 System Timer
IRQ8 RTC Clock
IRQ1 Keyboard
IRQ9 Unused
IRQ2 Cascade to IRQ
Controller
IRQ10 Unused
IRQ3 COM2/COM4
IRQ11 Unused
IRQ4 COM1/COM3
IRQ12 PS/2 mouse
IRQ5 Unused
IRQ13 FPU
IRQ6 FDC
IRQ14 Primary IDE
IRQ7 Printer
IRQ15 Secondary IDE
DMA Channel Assignments
DMA Channel
Function
0
Available
1
Available
2
Floppy Disk (8-bit transfer)
3
Available
4
Cascade for DMA controller 1
5
Available
6
Available
7
Available
Содержание ROCKY-P258BX
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