Acer Travelmate 720 Service Guide

							Chapter 1 13
Bottom Port
  
IconPortConnects to...
Mini docking 
connectorDockMate V mini docking station
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							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 timer Edge trigger
IRQ1 Keyboard Edge trigger
IRQ2 (cascade) Edge trigger
IRQ3 Modem/COM1 
(can be disable)Edge trigger Dynamically 
programmable
IRQ4 Infrared Edge trigger Dynamically 
programmable
IRQ5 SoundBlaster 
Audio (PCI 
device)Level trigger  PCI interrupt 
sharing
IRQ6 Floppy Edge trigger
IRQ7 Printer Edge trigger  Dynamically 
programmable
IRQ8 Real time clock Edge trigger
IRQ9 (SCI for ACPI 
OS) PCI deviceLevel trigger  PCI interrupt 
sharing
IRQ10 Modem Edge trigger Dynamically 
programmable
IRQ11 PCI device Level trigger PCI interrupt 
sharing
IRQ12 Pointing device Edge trigger
IRQ13 Math 
coprocessorEdge trigger
IRQ14 Hard disk driver
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							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 Interrupt controller-2
0C0-0DF DMA controller-2
1F0-1F7 Hard disk select
220-22F Audio (option)
230-23F Audio (option)
240-24F Audio (option)
250-25F Audio (option)
278-27F Parallel port 3
2E8-2EF COM4
2F8-2FF COM2
378, 37A Parallel port 2
3BC-3BE Paraller port 1
3B4, 3B5, 3BA Video subsystem
3C0-3C5 Video subsystem
Interrupt channel default assignment
ChannelDefault settingmodeRemarks
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							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 voltage 1.8V
Processor I/O voltage 2.5V
BIOS
ItemSpecification
BIOS vendor Phoenix
BIOS Version V1.0 
BIOS ROM type ROM
BIOS ROM size 256KB
BIOS package 32 PIn PLCC
Support  protocol PCI 2.1, APM 1.2, DMI 2.00.1, E-IDE, ACPI 1.0, ESCD 
1.03, ANSI ATA 3.0, PnP 1.1a, Bootable CD-ROM 1.0, 
ATAPI
BIOS password control RTC battery
System Memory
ItemSpecification
Memory controller MTXC
Onboard memory size 0MB
DIMM socket number 2 sockets (2 banks)
I/O address map
AddressDevice
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							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 128MB 256MB
Second-Level Cache
ItemSpecification
Cache controller MTXC
Tag RAM location IMM
Tag RAM size 32K*8x1
Tag RAM voltage 3.3V
SRAM type PBSRAM
SRAM size 256K/512K
SRAM location IMM
SRAM configuration 32K*64 or 64K*32
SRAM speed Cycle time = 7ns
System Memory
ItemSpecification
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							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) 1024x768 (64K colors) True Color
External CRT Resolutions and Modes
ResolutionCRT Refresh RateSimultaneous 
on TFT LCD
CRT only LCD SVGA
640x480x256 60,75,85 Y Y
640x480x64K 60,75,85 Y Y
640x480x16M 60,75,85 Y Y
800x600x256 60,75,85 Y Y
800X600X64K 60,75,85 Y Y
800x600x16M 60,75,85 Y Y
1024x768x256 60,70,75 Y Y
1024X768X64K 60,70,75 Y Y
Parallel Port
ItemSpecification
Parallel port controller NS PC97338
Second-Level Cache
ItemSpecification
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							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 Yes
Connector type 9-pin D-type
Location Rear side
Serial port function control Enable/disable by BIOS Setup
Selectable serial port (via BIOS Setup) 3F8h, 2F8h, 3E8h, 2E8h, Disabled
Selectable serial port IRQ (via BIOS 
Setup)IRQ3, IRQ4, IRQ10, IRQ11
FIR
ItemSpecification
Vendor & model name IBM 31T1100
Input power supply voltage 5V
Transfer data rate 4 Mbps
Transfer distance SIR mode--Min 2.0, Typ 2.6
1.2 Mbps--Min 1.4, Typ 2.0
4 Mbps--Min 1.1, Typ 1.5
Compatible standard IrDA (Infrared Data Association) 1.1, 
HP-SIR and Sharp ASK
Output Radiant Intensity Half Angle +-15
Number of Irda ports 1
16550 UART support Yes
Parallel Port
ItemSpecification
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							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 
panel
Internal speaker / Quantity Yes / 2 pieces, on both hinge sides
MPU-401 UART support Yes
PCMCIA
ItemSpecification
PCMCIA controller TI PCI1251A
PCMCIA voltage controller TI TPS2206
Supported card type Type-II / Type-III
Number of slots Two Type-II or one type-III
Access location Right side
ZV (Zoomed Video) port support Yes*2
32 bit CardBus support Yes
Fax/Modem
ItemSpecification
Chipset Lucent 
Fax modem data baud rate (bps) 56K
Data modem data baud rate (bps) 56K
FIR
ItemSpecification
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							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 & model name MITSUMI D353F3
Floppy Disk Specifications
Media recognition 2DD (720K) 2HD (1.2M, 
3mode)2HD (1.44M)
Sectors / track 9 15 18
Tracks 80 80 80
Data transfer rate
(Kbit/s)250 300 500 500
Rotational speed (RPM) 300 360 360 300
Read/write heads 2
Encoding method MFM
Power Requirement
Input Voltage (V) +5 +-10%
Hard disk drives
ItemSpecification
Vendor & Model Name IBM DCXA-
210000IBM DADA-
26480
Fax/Modem
ItemSpecification
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							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 24X
Performance Specification
Speed (KB/sec) 2100 (ave.speed), 3600 (max)
Access time (ms) 150 (Typ.)
Buffer memory (KB) 128
Interface Enhanced IDE compatible
Applicable disc format CD-DA, CD-ROM, CD-ROM XA (except 
ADPCM), CD-I, Photo CD (Multisession), Video 
CD, CD+
Loading mechanism Soft eject (with emergency eject hole)
Power Requirement
Input Voltage (V) 5
Battery
ItemSpecification
Vendor & model name Sony BTP-1931
Battery Type Li-ion (Graphite)
Hard disk drives
ItemSpecification
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