Acer Travelmate 720 Service Guide

Chapter 1 13
Bottom Port
  
IconPortConnects to...
Mini docking 
connectorDockMate V mini docking station
720.book  Page 13  Saturday, March 6, 1999  10:00 AM 

14 System Specifications
Hardware Configuration and Specifications
Memory Address Map
Address RangeDefinitionFunction
000000-09FFFF 640 KB memory Base memory
0A0000-0BFFFF 128 KB video RAM Reserved
0C0000-0CBFFF Video BIOS Video BIOS
0F0000-0FFFFF 64 KB system BIOS System BIOS
100000-top limited Extended memory SIMM memory
FE0000-FFFFFF 256 KB system ROM Duplicate of code 
assignment at 0E0000-
0FFFFF
Interrupt channel default assignment
ChannelDefault settingmodeRemarks
NMI System errors
IRQ0 System...

Chapter 1 15
IRQ15 CD-ROM driver
DMA channel default assignment
ChannelDefault settingMode
DRQ/DACK0 Reserved 8-bit
DRQ/DACK1 ECP 8-bit
DRQ/DACK2 Floppy 8-bit
DRQ/DACK3 Fast Infrared 8-bit
DRQ/DACK5 Reserved 16-bit
DRQ/DACK6 Reserved 16-bit
DRQ/DACK7 Reserved 16-bit
I/O address map
AddressDevice
000-00F DMA controller-1
020-021 Interrupt controller-1
040-043 Timer 1
048-04B Timer 2
060-06E Keyboard controller 8742 chip select
070-071 Real-time clock and NMI mask
080-08F DMA page register
0A0-0A1...

16 System Specifications
3C6-3C9 Video DAC
3C0-3CF Enhanced graphics adapter
3E0-3E1 PCMCIA controller
3E8-3EF COM3
3F0-3F7 Floppy disk controller
3F8-3FF COM1
CF8-Cff PCI configuration register
Processor
ItemSpecification
Processor type Intel Dixson (300/333Mhz) MMC-2 module
1.  Intel Pentium II architecture
2.  16 KB instruction cache and 16 KB data cache with 
MMX Technology
3.  Quick Start for low power, low exit latency clock 
throttling
Processor package  IMM module, 512KB L2 cache
Processor core...

Chapter 1 17
Supported memory size per DIMM 16/32/64/128 MB
Supported maximum memory size 256MB (128MB x 2)
Supported DIMM type Synchronous DRAM
Supported DIMM Speed SDRAM: With SPD without parity
Supported DIMM voltage 3.3V
Supported DIMM package 144-pin DIMM
DIMM Memory Combinations
Slot 1Slot 2Total Memory
16MB 0 16MB
0 16MB 16MB
0 32MB 32MB
0 64MB 64MB
16MB 16MB 32MB
16MB 32MB 48MB
16MB 64MB 80MB
16MB 128MB 144MB
32MB 32MB 64MB
32MB 64MB 96MB
32MB 128MB 160MB
64MB 64MB 128MB
64MB 128MB 192MB
128MB...

18 System Specifications
SRAM voltage 3.3V
1st level cache control always enabled
2st level cache control always enabled
Cache scheme control Fixed in Write-back
Video memory
ItemSpecification
Fixed or upgradeable Fixed, built-in NM2200 video controller
Memory size 2.5 MB
Video
itemSpecification
Chip vendor NeoMagic
Chip name NM2200
Chip voltage 3.3 Volts
ZV port support (Y/N) Yes
Graph interface (ISA/VESA/PCI) PCI bus
Max. resolution (LCD) 1024x768 (64K colors) True Color
Max. resolution (Ext. CRT)...

Chapter 1 19
Number of parallel ports 1
Location Rear side
Connector type 25-pin D-type
Parallel port function control Enable/Disable by BIOS Setup
ECP support Yes (set by BIOS setup)
Selectable ECP DMA channel (in BIOS 
Setup)DMA channel 1
DMA channel 3
Selectable parallel port I/O address 
(via BIOS Setup)3E8h, 2E8h, 378h, 278h, Disabled
Selectable parallel port IRQ (via BIOS 
Setup)IRQ5, IRQ7
Serial Port
ItemSpecification
Serial port controller NS PC97338
Number of serial ports 1
16550 UART support...

20 System Specifications
FIR location Left side
Selectable serial port (by BIOS Setup) 2F8h, IRQ3, Disabled
Audio
ItemSpecification
Audio Controller NeoMagic NMG5 + NMA2 
Audio onboard or optional Built-in
Mono or Stereo Stereo
Resolution 16-bit
Compatibility SB-16, Windows Sound System
Mixed sound source Voice, Synthesizer, Line-in, 
Microphone, CD
Voice channel 8-/16-bit, mono/stereo
Voice control location Right side
Sampling rate 44.1 KHz
Internal microphone Yes, on the left-higher corner of LCD...

Chapter 1 21
Support modem protocol V.34 data modem, V.17 fax modem, 
voice/audio mode, and digital 
simultaneous voice and data (DSVD) 
operation over a dial-up telephone line
PCI
Modem connector type RJ11 & RJ45 combo phone jack
Modem connector location Back side
Keyboard
ItemSpecification
Keyboard controller M38867
Keyboard vendor & model name API
Total number of keypads 84-/85-/88-key
Windows 95 keys Yes
Internal & external keyboard work 
simultaneouslyYe s
Disk drives
ItemSpecification
Vendor &...

22 System Specifications
Drive Format
Capacity (MB) 10050 6480
Bytes per sector 512  512
Logical heads 15 15
Logical sectors 63 63
Logical cylinders 16383 13424
Physical read/write heads 6 6
Disks 3 3
Spindle speed (RPM) 4200 4200
Buffer size (KB) 512 512
Interface IDE IDE
Data transfer rate (disk-buffer, Mbytes/s) 11.5~14.7 7.7~12.8
Data transfer, rate (host~buffer, Mbytes/s) 16.6/33.3 16.6/33.3
DC Power Requirements
Voltage tolerance 5+-5% 5+-5%
CD-ROM
ItemSpecification
Vendor & Model Name KMEUJDA150L...