Toshiba T2150 series User manual

T2150 Series
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1.1 Features
The Toshiba T2150 series Personal Computer uses extensive Large Scale Integration (LSI),
and Complementary Metal-Oxide Semiconductor (CMOS) technology to provide minimum
size and weight, low power usage, and high reliability. The T2150 series incorporates the
following features and benefits:
❑Microprocessor
The Intel DX4-75 microprocessor operates at 75 MHz and 3.3 Volts.
❑Math co-processor
The math co-processor is stored in the DX4 microprocessor.
❑Cache memory
The 16 KB cache memory is stored in the DX4 microprocessor.
❑Disk storage
The T2150 series has an internal 260 million bytes (250 MB) (TEG only) HDD and
520 million bytes (500 MB) HDD.
An external 3.5-inch Floppy Disk Drive (FDD) supports 2HD (1.44 Mbytes) floppy
disks and 2DD floppy disks (720 Kbytes) floppy disks.
❑CD-ROM Drive
The internal CD-ROM drive is full-size and double-speed. This drive can run 12cm or
8cm disks without an adapter, and supports the following formats: Audio CD, Photo
CD, and ISO 9660 formats.
❑Memory
Standard memory includes 4 MB of CMOS RAM and comes with 8MB. This in-
cludes 640 KB of conventional memory with 3264 KB of extended memory for the
T2150CDS and 7360 KB for the T2150CDT, which can be utilized as expanded
memory compatible with the Lotus/Intel/Microsoft Expanded Memory Specification
(LIM-EMS).
❑Display
The T2150CDS has a 10.4" full-color, Supertwist Nematic (STN) LCD with 640x480
pixels.
The T2150CDT has a 10.4" full-color, Thin-Film Transistor (TFT) LCD with
640x480 pixels.
The T2150 series internal display controller supports Video Graphics Array (VGA)
for internal display and Super VGA (SVGA) for external display.

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T2150 Series
❑Keyboard
An easy-to-use 82/84-key enhanced keyboard with full-size keys and standard spacing
is compatible with IBM standard software. The computer’s keyboard supports soft-
ware that uses a 101- or 102-key enhanced keyboard.
❑Batteries
The T2150 series has three different batteries: a main battery, a backup battery, and a
Real Time Clock (RTC) battery.
❑Expansion Memory Slot
An optional 4, 8, 16, or 24 MB memory module can be installed in the memory slot.
❑Personal Computer Memory Card International Association (PCMCIA) card slot
The PC card slot supports up to two Personal Computer Memory Card International
Association (PCMCIA) standard version release 2.0 cards. The upper and lower slots
can each accommodate one Type II (5.0mm) card. The lower slot can accommodate
one Type III (10.5mm) card when the upper slot is empty.
❑Parallel port
The Centronics compatible parallel interface port can be used to connect a Centronics
compatible printer or other parallel device. The port has ECP (Enhanced Capabilities
Port) conforming to IEEE•P1284.
❑RS-232-C port
The T2150 series has one 9-pin serial interface port.
❑External Keyboard port
The PS/2 type keyboard interface connector connects with a PS/2 compatible key-
board.
❑Port replicator port
The port replicator port enables connection of a port replicator. The port replicator
enables connections to the following ports: PS/2 mouse, PS/2 keyboard, parallel port,
serial port, DC IN socket, joystick/MIDI port, audio line-in, audio line-out, headphone
jack with volume control dial, external FDD, and external monitor.
❑External monitor port
One 15-pin RGB port on the back can be connected to an external video display.

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❑AccuPoint
The pointer control stick, located in the center of the keyboard, provides convenient
control of the cursor without requiring desk space for a mouse.
❑Sound System
The Sound Blaster™ Pro™ compatible sound system gives multimedia capability
with a built-in microphone and speaker. The sound system provides a volume control
dial and jacks to connect external audio devices: headphone, microphone, and audio
line-in.
The T2150 series Personal Computer is shown in figure 1-1.
Figure 1-1 T2150 series personal computer

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T2150 Series
1.2 System Unit Block Diagram
Figure 1-2 is a block diagram of the T2150 series system unit.
Figure 1-2 T2150 series system board block diagram

T2150 Series
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The T2150 series system board has the following functional components:
❑One Intel DX4-75 32-bit microprocessor.
Intel DX4 operates at 75 MHz and 3.3 volts.
❑Standard RAM
4 Mbytes, two 1024x16-bit chips with no parity bit. (T2150CDS)
8 Mbytes, four 1024x16-bit chips with no parity bit. (T2150CDT)
5-volt operation.
Available high speed page mode access.
Access time 70 ns.
Data transfer is 32-bit width.
❑Cache memory
The 16 Kbytes of cache memory is stored inside the DX4 processor.
Four-way set-associative method.
❑BIOS ROM (Flash EEPROM)
128 Kbytes (one 128Kx8-bit chip) memory.
64 Kbytes in the ROM are used for system BIOS.
40 Kbytes in the ROM are used for VGA BIOS.
24 Kbytes in the ROM are reserved.
Access time 150 ns.
Data transfer is 8-bit width.
❑Video RAM
1 Mbyte, two 256Kx16-bit chips.
5-volt operation.
Access time 70 ns.
❑Optional memory
One expansion memory slot is available for 4, 8, 16, and 24 Mbyte
memory modules, which consist of 1024Kx16-bit chips with no parity
bit.
Maximum memory size is 28 Mbytes for the T2150CDS and 32
Mbytes for the T2150CDT (if a 24 Mbyte memory card is installed).
5-volt operation.
High-speed page mode access.
Access time 70 ns.

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T2150 Series
❑One super integration (SI)
The following components:
- Two DMACs 8237 equivalent
- Two PICs 8259 equivalent
- Two SIOs 16550 equivalent (One SIO is not used)
- One PIT 8254 equivalent
- One FDC TC8565 equivalent
- One VFO TC8568 equivalent
- One I/O port decode
- One SIO port control
- One printer port control supported ECP
- One FDD control
- One speaker control
- One power communication control
❑System Controller Gate Array (VALCNT-GA)
This gate array has the following functions:
Data Bus driver
CPU data <==> ISA data
Address Bus driver
CPU address <==> ISA address
ISA control
SYCLK, DMCLK generation
ISA cycle control
DMA support control
External master support control
Refresh control
A20 control
RTC control
Clock/Reset/Suspend control
CPU clock control
STPCLK# and INTR/NMI/SMI# adjustment
SMI control
Current pass-through control
Suspend/Resume sequence
Reset generation
DMA control
Timing signal generation for DRAM
Cache control
DRAM address control
Level Shift Gate Array control
VGA chip control

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❑I/O Controller Gate Array (IOCNT-GA)
This gate array has the following functions:
Hotkey control
BIOS ROM interface
PS interface
NEXUS GA function
Internal communication control
KBC, main CPU communication register file
KBC interrupt control
KBC communication control
❑PCMCIA Controller Gate Array
This gate array has the following functions:
PCMCIA memory card control
❑Level Shift Gate Array
This gate array has the following functions:
Level shift 5V data bus <==> 3V data bus
❑Video Controller LSI (C&T 65545)
The T2150 series internal display controller (3.3/5 volts operation)
controls the internal VGA display and external SVGA compatible
display.
❑Keyboard Controller (KBC)
One M38802 chip is used.
This KBC includes the keyboard scan controller and keyboard inter-
face controller. The KBC controls the internal keyboard, external
keyboard port, and PS/2 mouse port.
❑Real Time Clock (RTC)
One T9934 chip is used. The T9934 has 128 bytes of memory. Four-
teen bytes of memory are used for the calender and clock. The re-
maining 114 bytes are used for the system configuration data.

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T2150 Series
1.3 3.5-inch Floppy Disk Drive
The T2150 series 3.5-inch Floppy Disk Drive (FDD) is a thin, high-performance reliable
drive that supports 720-KB (formatted) 2DD and 1.44-MB (formatted) 2HD 3.5-inch floppy
disks.
The T2150 series FDD is shown in figure 1-3. The specifications for the FDD are described
in table 1-1.
Figure 1-3 3.5-inch FDD
Table 1-1 3.5-inch FDD specifications
Item 2-MB mode 1-MB mode
Storage capacity (KB)
Unformatted 2,000 1,000
Formatted 1,311 737
Number of heads 2 2
Number of cylinders 80 80
Access time (ms)
Track to track 3 3
Average 181 181
Head settling time 15 15
Recording track density (tpi) 135 135
Data transfer rate (Kbps) 500 250
Rotation speed (rpm) 300 300
Recording method Modified Frequency Modulation (MFM)

T2150 Series
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1.4 2.5-inch Hard Disk Drive
The Hard Disk Drive (HDD) is a random access non-volatile storage device. It has a non-
removable 2.5-inch magnetic disk and mini-winchester type magnetic heads.
The T2150 series supports 260 million bytes (250MB) (TEG only) and 520 million bytes
(500 MB) drive.
The T2150 series HDD is shown in figure 1-4. Specifications for the HDD are described in
table 1-2.
Figure 1-4 2.5-Inch HDD
Table 1-2 2.5-inch HDD specifications
250 MB 500 MB
(MK1724FCV) (IBM-DBOA-2528)
Physical specifications
Formatted capacity (Mbytes) 262 528
Number of disks 2 2
Data heads 16 16
Data surfaces 4 3
Tracks per surface 842 1,024
Sectors per track 38 63
Bytes per sector 512 512
Access time (ms)
Track to track 3 3
Average 13 13/14 (R/W)
Maximum 25 23/24 (R/W)
Rotation speed (rpm) 4,000 4,000
Data transfer rate (bps)
To/from media 18.9 to 31.6 M 26.9 to 39.5 M
Interleave 1:1 1:1
Recording method 1-7 RLL 1-7 RLL

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T2150 Series
1.5 Keyboard
The 82-(USA) or 84-(European) keyboard is mounted on the T2150 series system unit. The
keyboard is connected to the keyboard controller on the system board through a 25-pin flat
cable. The T2150 series pointer control stick, located in the center of the keyboard, provides
convenient control of the cursor without requiring desk space for a mouse. The keyboard is
shown in figure 1-5.
See Appendix E for optional keyboard configurations.
Figure 1-5 Keyboard

T2150 Series
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1.6 CD-ROM Drive
The T2150 series internal CD-ROM drive accommodates either 12 cm (4.72") or 8 cm
(3.15") CDs. It provides high-performance, double-speed play (reads 300KB per second).
This drive supports the following formats:
Audio CD
Photo CD
ISO 9660
The T2150 series CD-ROM drive is shown is figure 1-6. The specifications for the CD-ROM
drive are described in table 1-3.
Figure 1-6 CD-ROM
Table 1-3 CD-ROM specifications
Item 1X mode 2X mode
Data capacity (bytes/block)
Mode 1 2,048
Mode 2 2,336
Transfer Rate
Sustained Block transfer speed (blocks/s) 75 150
Sustained Data transfer speed (kbytes/s) 150 300
Mode 1 150 300
Mode 2 171 342
ATAPI Burst (Mbytes/s) 3.33 (PIO mode 0)
Access time (ms)
Average Random Access 360 265
Average Random Seek 250 210
Average Full Stroke Access 540 450
Rotation speed (rpm) 200 to 530 400 to 1,060
Data Buffer Capacity (Kbytes) 128

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T2150 Series
1.7 STN Color LCD (T2150CDS)
The STN Color Liquid Crystal Display (LCD) contains an LCD module, a Fluorescent Lamp
(FL), and an FL inverter board.
1.7.1 STN Color LCD Module
The T2150CDS STN color LCD is backlit and supports 640x480 pixels with a Video control-
ler. This video controller includes the functions of Video Graphics Array (VGA).
The T2150CDS’s LCD receives vertical and horizontal synchronizing signals, 16-bit data
signal, 8-bit upper block data signal, 8-bit lower block data signal, and has a shift clock for
data transmission. All signals are CMOS-level compatible.
The STN LCD is shown in figure 1-7. The specifications for the LCD are described in table
1-4.
Figure 1-7 STN color LCD
Table 1-4 STN color LCD specifications
Item Specifications
Number of Dots (dots) 640x480
Dot pitch (mm) 0.33x0.33
Display area (mm) 217.2 (W)x164.4 (H)
Contrast (Typically) 20:1
FL current (mA) 5.0
FL frequency (KHz) 40

T2150 Series
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1.7.2 STN Color Fluorescent Lamp (FL) Inverter Board
The FL inverter board supplies high frequency current to light the LCD’s Fluorescent Lamp.
The specifications for the FL inverter are described in table 1-5.
Table 1-5 STN color FL inverter board specifications
Item Specifications
Input Voltage (VDC) 5
Power (W) 4.25
Output Voltage (VAC) 1,100
Current (mA) 5.0
Frequency (KHz) 40

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T2150 Series
1.8 TFT Color LCD (T2150CDT)
The TFT Color Liquid Crystal Display (LCD) contains an LCD module, a Fluorescent Lamp
(FL), and an FL inverter board.
1.8.1 LCD Module
The T2150CDT TFT color LCD supports 640x480 pixels with an internal display controller.
This controller includes the functions of Video Graphics Array (VGA) and Super VGA
(SVGA) for external display.
The T2150CDT’s LCD receives 18-bit data signals, data enable signals, and a shift clock
for data transmission. All signals are CMOS-level compatible.
The TFT LCD is shown in figure 1-8. The specifications for the LCD are described in table
1-6.
Figure 1-8 TFT color LCD
Table 1-6 TFT color LCD specifications
Item Specifications
Number of dots (dots) 640x480
Dot pitch (mm) 0.33 (W)x0.33 (H)
Display area (mm) 211.2 (W)x158.4 (H)
Contrast 60:1 (minimum)
FL current (mA) 4.0
FL frequency (KHz) 40

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1.8.2 Fluorescent Lamp (FL) Inverter Board
The FL inverter board supplies high frequency current to light the LCD’s Fluorescent Lamp.
The specifications for the FL inverter are described in table 1-7.
Table 1-7 FL inverter board specifications
Item Specifications
Input Voltage (VDC) 5
Power (W) 4.25
Output Voltage (VAC) 1,100(r.m.s.)
Current (mA) 4.0
Frequency (KHz) 40

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T2150 Series
1.9 Power Supply
The power supply provides five kinds of voltages to the T2150 series system board. The
T2150 series power supply has one microprocessor and it operates at 500 KHz. It contains
the following functions:
1. Determines if the AC cord or battery is connected to the computer.
2. Detects DC output and circuit malfunctions.
3. Controls the LED indicator and speaker.
4. Turns the battery charging system on and off and detects a fully charged battery.
5. Determines if the power can be turned on and off.
6. Provides more accurate detection of a low battery.
7. Calculates the remaining battery capacity.
The power supply output rating is specified in table 1-8.
Table 1-8 Power supply output rating
DC Regulation Maximum
Use for Name voltage tolerance current Ripple
(V) (%) (mA) (mV)
System logic, FDD, HDD, VCC +5 ±5 1,400 100
Display
PCMCIA, Flash ROM P12V +12 ±5 100 240
CPU, GA B3V +3.3 ±5 1,100 60
VRAM, GA, RAM B5V +4.7 ±5 650 100

T2150 Series
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1.10 Batteries
The T2150 series has three types of batteries:
❑Main battery pack
❑Backup battery
❑Real Time Clock (RTC) battery
These battery specifications are described in table 1-9.
Table 1-9 Battery specifications
Battery name Material Outputvoltage Capacity
Main battery Nickel Metal Hydride 12 V 2,600 mAH
Backup battery Nickel Metal Hydride 7.2 V 120 mAH
RTC battery Lithium-Vanadium 3.0 V 50 mAH
1.10.1 Main Battery
The removable main battery pack is the computer’s main power source when the AC power
cord is not attached. The main battery recharges the backup battery when the system’s power
is on. The backup and main battery maintain the state of the computer when you enable
AutoResume.
❑Battery Indicator
The Battery indicator is located on the front of the T2150 series. The indicator shows
the status of the removable battery pack.
The status of each can be determined by color:
Orange The battery is being charged. (AC power cord is attached.)
Green The battery is fully charged. (AC power cord is attached.)
Blink orange The battery is low when the power is on.
No light Under any other conditions, the LED does not light.

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T2150 Series
1.10.2 Battery Charging Control
Battery charging is controlled by a power supply microprocessor that is mounted on the
power supply. The microprocessor controls whether the charge is on or off and detects a full
charge when the AC power cord and battery are attached to the computer. The system
charges the battery using quick charge or trickle charge.
❑Quick Battery Charge
When the AC power cord is attached, there are two types of charge: quick charge
when the system is powered off and trickle charge when the system is powered on.
Table 1-10 Time required for quick charges
Chargingtime
Power off About 2.5 hours
Power on Trickle charge
If one of the following occurs, the battery quick-charge process stops.
1. The battery becomes fully charged.
2. The battery is removed.
3. The battery or AC output voltage is abnormal.
4. The charge current is abnormal.
❑Trickle Battery Charge
When the main battery is fully charged and the AC power cord is attached, the power
supply microprocessor automatically changes quick charge to trickle charge.

T2150 Series
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1.10.3 Backup Battery
The backup battery maintains data for AutoResume. The power source used to back-up the
AutoResume data is determined according to the following priority:
AC power > Main battery > Backup battery
The backup battery is charged by the main battery or AC power cord when the system is
powered on. Table 1-11 shows the charging time and data preservation period of the backup
battery.
Table 1-11 Backup battery charging/data preservation time
Time
Charging Time Power On 20 H
Power Off (with AC power) 20 H
Power Off (Without AC power) Doesn’t charge
Data preservation period (full charge) 5 H
1.10.4 RTC Battery
The RTC battery provides power to keep the current date, time, and other setup information
in memory while the computer is turned off. Table 1-12 shows the charging time and data
preservation period of the RTC battery.
Table 1-11 RTC battery charging/data preservation time
Time
Charging Time With AC power 48 H
or main battery
Data preservation period (full charge) 1 month

T2150 Series
2-1
2.1 Troubleshooting
Chapter 2 describes how to determine if a Field Replaceable Unit (FRU) in the T2150 series is
causing the computer to malfunction. The FRUs covered are:
1. System Board(s)
2. Sound Board
3. Floppy Disk Drive
4. Hard Disk Drive
5. CD-ROM Drive
6. Keyboard
7. Display
The Diagnostics Disk operations are described in Chapter 3 and detailed replacement proce-
dures are given in Chapter 4.
The following tools are necessary for implementing the troubleshooting procedures:
1. A T2150 series Diagnostics Disk
2. A Phillips head screwdriver (2 mm)
3. A Toshiba MS-DOS system disk(s)
4. A 2DD or 2HD formatted work disk for floppy disk drive testing
5. A cleaning kit for floppy disk drive troubleshooting
6. A printer port LED
7. An RS-232-C wraparound connector
8. A printer wraparound connector
9. A multimeter
10. An external CRT