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MEMORY ADDRESS MAP
Address Range (Hex)
000000H - 09FFFFH
0A0000H - 0BFFFFH
0C0000H - 0EFFFFH
0F0000H - 0FFFFFH
0100000H - 7FFFFFFFH
DMA CHANNELS
CHANNEL
DMA 0
DMA 1
DMA 2
DMA 3
DMA 4
DMA 5
DMA 6
DMA 7
INTERUPT CONTROLLER
IRQ
IRQ 0
IRQ 1
IRQ 2
IRQ 3
IRQ 4
IRQ 5
IRQ 6
IRQ 7
IRQ 8
IRQ 9
IRQ 10
IRQ 11
IRQ 12
IRQ 13
IRQ 14
IRQ 15
NMI
Description
640 KB of Conventional RAM
128 KB of Video RAM
256 KB of I/O Expansion ROM
64 KB of System BIOS ROM
1 MB ~ 128MB of User RAM
Function
Reserved
Reserved
Floppy Disk Controller
ECP Parallel Port
Cascade for DMA #1
Reserved
Reserved
Reserved
Function
System timer output
Keyboard
Cascade for INTC #2
Serial port #2
Serial port #1
Parallel port #2
Floppy disk controller
Parallel port #1
Real time clock
Software redirected to INT 0AH (IRQ 2)
Reserved
Reserved
PS/2 Mouse
Math Coprocessor (CPU Internal)
Primary Hard disk
Secondary Hard Disk
Parity Check Error
~ 49 ~
TECHNICAL REFERENCE
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