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1
st MB Memory Address Map
Memory address
Description
00000-9FFFF
SYSTEM MEMORY
A0000-BFFFF
VGA BUFFER
C0000-C7FFF
VGA BIOS
C8000-CDFFF
NO USE
CE000-CFFFF
DEFAULT DOC2000 ADDRESS
E0000-FFFFF
SYSTEM BIOS
100000
EXTEND MEMORY
IRQ Mapping Chart
IRQ0 System Timer
IRQ8 RTC clock
IRQ1 Keyboard
IRQ9 SCSI PORT A
IRQ2 IRQ Controller
IRQ10 LAN
IRQ3 COM2
IRQ11 LAN
IRQ4 COM1
IRQ12 PS/2 mouse
IRQ5 AUDIO
IRQ13 FPU
IRQ6 FDC
IRQ14 Primary
IDE
IRQ7 Printer
IRQ15 Secondary IDE
DMA Channel Assignment
Channel Function
0
Available
1
Available
2
Floppy
disk
3
Available
4
Cascade for DMA controller 1
5
Available
6
Available
7
Available
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Appendix C. ATX Power Supply
The following notes show how to connect ATX Power Supply to the
backplanes and / or the ISBC card.
A. For backplanes with ATX Connector
1. Please, disconnect the AC cord of the Power Supply from the AC
source to prevent sudden electric surge to the board.
2. Please, check the type of your CPU board. All CPU board listed on
the next page support ATX power supply but has two types of
power switch connection:
2.1. ROCKY-772EV (through Power Button & GND):
Connect the ATX power button switch to the CN3 (power
button). And connect the power cable from Backplane to CN13
of CPU card.
If you want to turn ON the system, just press the button once.
And if you want to turn off the power supply, please press the
ATX power switch button for about 4 seconds.