Serial Port; Memory Address Map - Acer Altos G520 Service Manual

Serial Port

Item
Serial port controller
Serial port controller resident bus
Number of serial port
Supports 16550 UART
Connector type
Optional serial port I/O address
(via BIOS Setup)
Optional serial port IRQ
(via BIOS Setup)

Memory Address Map

Address
0000000-009FFFF
00A0000-00BFFFF
00C0000-00C7FFF
00C8000-00CFFFF
00D0000-00D3FFF
00D4000-00D7FFF
00D8000-00DBFFF
00DC000-00DFFFF
00E0000-00E7FFF
00E8000-00EFFFF
00F0000-00FFFFF
0100000-0F9FFFF
0FA0000-0FFFFFF
1000000-FFFFFFF
I/O Address Map
Hex Range
000-01F
020-027
030-037
040-047
050-057
060-06F
070-07F
080-09F
0A0-0BF
Chapter 1
Built-in National Semiconductor PC87417 super I/O
controller
ISA bus
2
Yes
9-pin D-type female connector
3F8h
2F8h
3E8h
2E8h
IRQ 4
IRQ 11
Size
640 KB System Memory
128 KB Video RAM
32 KB for VGA BIOS
32 KB I/O Expansion ROM
16 KB I/O Expansion ROM
16 KB I/O Expansion ROM
16 KB I/O Expansion ROM
16 KB I/O Expansion ROM
32 KB for SCSI BIOS
32 KB
64 KB BIOS
System Memory
384 KB I/O Card Memory
System Memory
DMA Controller-1, 8237
Interrupt Controller-1 8259
Interrupt Controller-1 8259
System Timer (8254-1)
System Timer (8254-1)
Keyboard Controller 8742
Real-Time Clock, NMI Mask
DMA Page Register 74LS612
Speed Status Register
Interrupt Controller-2 8259
Specification
Function
Onboard DRAM
Reserved for Graphics Display Buffer
Non-Cacheable
Reserved for onboard VGA
Reserved for ROM on I/O Adapters
Reserved for ROM on I/O Adapters
Reserved for ROM on I/O Adapters
Reserved for ROM on I/O Adapters
Reserved for ROM on I/O Adapters
Reserved for SCSI BIOS
Reserved Onboard
System ROM BIOS (ROM)
System RAM BIOS (DRAM)
Onboard DRAM
Reserved for Memory Map
I/O Card
Non-Cacheable
Onboard DRAM
Device Function
17