Acer 420 manual Mechanical Specification, Memory Address Map, VGA Bios

Environmental Requirements

Item	Specification
Non-operating	10% to 90% RH, non-condensing (storage package)
Vibration
Operating (unpacked)	5~500Hz: 1.0G
Non-operating (unpacked)	50~500Hz: 2.16G

Mechanical Specification

Item	Specification
Dimensions	327mm (W) x 269mm (D) x 35.9mm (H) for 14.1/15.0 inch model
Weight	6.3lb (2.86kg) for 14.1 inch model
	6.6lb (2.99kg) for 15.0 inch model
I/O Ports	One type II CardBus slots, One RJ-11 modem jack,One RJ-45 network jack,
	One DC-in jack for AC adapter, One ECP/EPP-compliant parallel port, One
	external monitor port, One headphone/speaker/line-out jack (3.5mm mini jack),
	One microphone/line-in jack (3.5mm mini jack), One S-video-out (NTSC/PAL)
	port, Three Universal Serial Bus (USB) ports, One IEEE 1394 port, 100-pin port
	replicator connector for Acer EasyPort, One SD/MMC slots, One memory stick
	slot
Drive Bays	two
Material	Recycle plastic PC+ABS 94V0
Indicators	Power, Media activity, Battery charge, Wireless communication, Caps lock, Num
	lock and Sleep indicators
Switch	Power switch
	Lid switch
	Internet switch
	Wireless ON/OFF switch
	E-mail switch

Memory Address Map

Memory Address	Size	Function
000E0000h-000FFFFFh	128KB	System BIOS
000C0000h-000CFFFFh	64KB	VGA BIOS
000A0000h-000BFFFFh	128KB	Video memory (VRAM)
00000000h-0009FFFFh	640KB	Conventional memory
I/O Address Map
I/O Address	Function
0000-001F	Direct memory access controller
0000-0CF7	PCI bus
0020-0021	Programmable interrupt controller
0024-0025	Programmable interrupt controller
0028-0029	Programmable interrupt controller
002C-002D	Programmable interrupt controller
002E-002F	Motherboard resources
0030-0031	Programmable interrupt controller
0034-0035	Programmable interrupt controller
0038-0039	Programmable interrupt controller
003C-003D	Programmable interrupt controller
0040-0043	System timer

34 Chapter 1