GA-586AL
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38
5.2. I/O & MEMORY MAP
MEMORY MAP:
[0000000-009FFFF]
System memory used by DOS and application program.
[00A0000-00BFFFF]
Display buffer memory for VGA/
EGA/CGA/MONOCHROME adapter.
[00C0000-00DFFFF]
Reserved for I/O device BIOS ROM or RAM buffer.
[00E0000-00EFFFF]
Reserved for PCI device ROM.
[00F0000-00FFFFF]
System BIOS ROM.
[0100000-BFFFFFF]
System extension memory.
I/O MAP:
[000-01F]
DMA controller.(Master)
[020-021]
INTERRUPT controller.(Master)
[022-023]
CHIPSET control registers I/O ports.
[040-05F]
TIMER control registers.
[060-06F]
KEYBOARD interface controller.(8042)
[070-07F]
RTC ports & CMOS I/O ports.
[080-09F]
DMA register.
[0A0-0BF]
INTERRUPT controller.(Slave)
[0C0-0DF]
DMA controller.(Slave)
[0F0-0FF]
MATH COPROCESSOR
[1F0-1F8]
HARD DISK controller.
[278-27F]
PARALLEL port-2.
[2B0-2DF]
GRAPHICS adapter controller.
[2F8-2FF]
SERIAL port-2.
[360-36F]
NETWORK ports.
[378-37F]
PARALLEL port-1
[3B0-3BF]
MONOCHROME & PRINTER adapter.
[3C0-3CF]
EGA adapter.
[3D0-3DF]
CGA adapter.
[3F0-3F7]
FLOPPY DISK controller.
[3F8-3FF]
SERIAL port-1.
5.3. TIMER & DMA CHANNELS MAP
TIMER MAP:
TIMER Channel-0 System timer interrupt
TIMER Channel-1 DRAM REFRESH request
TIMER Channel-2 SPEAKER tone generator
DMA CHANNELS:
DMA Channel-0 Available
DMA Channel-1 IBM SDLC
DMA Channel-2 FLOPPY DISK adapter
DMA Channel-3 Available
DMA Channel-4 Cascade for DMA controller 1
DMA Channel-5 Available
DMA Channel-6 Available
DMA Channel-7 Available
