Toshiba T3400 User manual

T3400/T3400CT Maintenance Manual

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1.1 Features

The Toshiba T3400/T3400CT is one of the lightest and most advanced portable computers

available. Utilizing advanced technology and high-speed components, the T3400/T3400CT

offers excellent display legibility, battery operation and IBM PC/AT compatibility. The

T3400/T3400CT system unit consists of the following features:

❑Microprocessor

The T3400/T3400CT uses an SL Enhanced Intel 486SX-33 microprocessor that

operates at 33 MHz, 3.3 Volts.

❑Cache memory

The T3400/T3400CT has an 8 Kilobyte (KB) cache memory stored in the i486SX

microprocessor.

❑Disk storage

The T3400/T3400CT has an internal 120 Megabyte (MB) Hard Disk Drive (HDD)

with an average access time of 17 milliseconds. An external 3.5-inch Floppy Disk

Drive (FDD) supports 2HD floppy disks (1.44 MB) and 2DD floppy disks (720 KB).

❑Memory

The T3400/T3400CT comes standard with 4 MB of CMOS Random-Access Memory

(RAM) 3.3 Volts. This includes 640 KB of conventional memory and 3,456 KB of

extended memory which can be utilized as expanded memory compatible with Lotus/

Intel/Microsoft-Expanded Memory Specifications (LIM-EMS).

❑Monochrome LCD (T3400)

A high-resolution, Liquid Crystal Display (LCD) displays 640 x480 pixels with a

64-level gray scale.

The T3400 internal display controller supports Video Graphics Array (VGA) func-

tions on the internal display and Super VGA (SVGA) functions on the external

display.

❑TFT color LCD (T3400CT)

A high-resolution, Thin-Film Transistor (TFT) full-color LCD displays 640 x 480

pixels. The T3400CT internal display controller supports VGA functions for internal

display and Super VGA (SVGA) functions for external display.

❑Keyboard

An easy-to-use 82/84-key keyboard includes a keypad overlay for fast numeric data

entry or cursor and page control. The computer keyboard supports software that uses

a 101- or 102-key enhanced keyboard.

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T3400/T3400CT Maintenance Manual

❑Batteries

The T3400/T3400CT has three batteries: a main battery, backup battery, and Real-

Time Clock (RTC) battery.

❑Personal Computer Memory Card International Association (PCMCIA) card slot

The T3400/T3400CT has one PCMCIA slot for installation of an MiNC Toshiba card

modem or other industry-standard PCMCIA release 2.0 card.

❑Parallel port

The T3400/T3400CT parallel interface port serves two purposes. The port can be

used to connect a Centronics-compatible printer or an external 5.25-inch floppy disk

drive.

❑RS-232C port

The T3400/T3400CT has one 9-pin serial interface port.

❑External 3.5-inch FDD port

The T3400/T3400CT has one external 3.5-inch FDD port.

❑Port replicator port

The T3400/T3400CT has one port replicator port which enables connection of an

optional port replicator or external monitor adapter. The port replicator allows

connection of an optional PS/2 keyboard, PS/2 mouse, and external monitor.

❑Memory module slot

The T3400/T3400CT has one slot for optional installation of a Toshiba memory

module.

❑Accupoint

The T3400/T3400CT has a pointer control stick in the center of the keyboard.

T3400/T3400CT Maintenance Manual

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The T3400/T3400CT Personal Computer is shown in Figure 1-1. T3400/T3400CT system

configuration is shown in Figure 1-2.

Figure 1-1 T3400/T3400CT Personal Computer

Figure 1-2 T3400/T3400CT System Unit Configuration

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T3400/T3400CT Maintenance Manual

1.2 System Unit Block Diagram

Figure 1-3 is a block diagram of the T3400/T3400CT system unit.

Figure 1-3 T3400/T3400CT System Board Block Diagram

T3400/T3400CT Maintenance Manual

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The T3400/T3400CT system board includes the following major components:

❑i486SX-33 CPU

❑Super Integration (SI) T9901 Gate Array (GA), which houses the following:

•Two Direct Memory Access Controllers (DMAC): 82C37

•Two Programmable Interrupt Controllers (PIC): 82C59

•One Programmable Interval Timer (PIT): 82C54

•One Floppy Disk Controller (FDC): TC8565

•One Serial Input/Output Controller (SIO): TC8570

•One Variable Frequency Oscillator (VFO): TC8568

•One Input/Output (I/O) Controller

•One Printer Port Controller

•One Speaker Controller

❑RTC

One T9934 chip with 128 bytes of memory is used. Fourteen bytes of memory are

used for the calendar and clock, and the remaining 114 bytes for system configura-

tion data.

OSC (X2) generates 32.768 KHz for the RTC.

❑Keyboard Controller (KBC)

One M37452M4 chip is used. This KBC includes the keyboard scan controller and

keyboard interface controller. The KBC controls the internal keyboard, Accupoint

(pointer control stick), external keyboard, and PS/2 mouse.

❑The following memories:

Standard RAM: 4 MB

Cache memory: 8 KB (inside CPU)

BIOS ROM: 128 KB (96 KB are used)

This ROM contains Initial Reliability Test (IRT), Basic

Input Output System (BIOS), and video BIOS.

Video RAM: 256 KB

Optional cards can be used to expand memory to a maximum of 20 MB.

❑VGA display controller (WD90C24)

This controller controls the internal VGA display and external SVGA- compatible

display.

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T3400/T3400CT Maintenance Manual

❑Clock Generator receives 14.31818 MHz (X3) and generates the following frequen-

cies:

•33 MHz for the CPU

•14.7477 MHz for the Communications (COM) port

•24 MHz for the FDC and VFO

•16 MHz is used for system controller GA

•14.31818 MHz is used for the SI T9901 GA

❑Gate Arrays

System Controller GA

This GA has the following functions:

•CPU Controller

•Memory Controller

-DRAM Controller

-Compatible Bus Interface Controller

•SMI Controller

•VL Bus Controller

•Bus Controller

-Compatible Bus Interface Controller

-Compatible Access Controller

-DMAC Controller

-I/O Controller

•Address Latch Controller

-32 to 16-Bit Controller

-Address Latch

-DMA Address Generator

-Refresh Address Generator

•I/O Register

-Compatible I/O Port

-Saving Register Controller data in AutoResume (resume mode)

-Toshiba Special Register

•Processing Speed Controller

•Data Bus Change Controller

•Data Latch

PCMCIA Controller GA

This GA has the following functions:

•Memory Card Controller

-PCMCIA IC Card Controller

-Toshiba Modem Card Controller

T3400/T3400CT Maintenance Manual

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1.3 External 3.5-inch Floppy Disk Drive

The 3.5-inch FDD is a thin, high-performance, reliable drive that supports 720-KB (format-

ted) 2DD and 1.44-MB (formatted) 2HD 3.5-inch floppy disks.

The FDD is shown in Figure 1-4. Specifications for the FDD are provided in Table 1-1.

Figure 1-4 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)

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T3400/T3400CT Maintenance Manual

1.4 2.5-inch Hard Disk Drive

The 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 T3400/T3400CT supports a 120 MB HDD.

The HDD is shown in Figure 1-5. Specifications for the HDD are provided in Table 1-2.

Figure 1-5 2.5-inch HDD

Table 1-2 2.5-inch HDD Specifications

Items (CP2124) (MK2124FC)

Storage capacity (MB)

Formatted 121.6 130.1

Number of disks 2 2

Data heads 4 4

Data surfaces 4 4

Tracks per surface 1,123 1,155

Sectors per track 53 (+1) 55 (+1)

Bytes per sector 512 512

Access time (ms)

Track to track 10 5

Average 17 17

Maximum 35 36

Rotation speed (rpm) 3,743 3,200

Data transfer rate (bps)

To/from media 18 M 15.3 M

Interleave 1:1 1:1

Recording method 2-7 RLL/ 1-7 RLL

1-7 RLL

T3400/T3400CT Maintenance Manual

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1.5 Keyboard

The 82-key (USA) or 84-key (European) keyboard is mounted on the system unit. The

keyboard is connected to the KBC on the system board via a 19-pin flat cable. The keyboard

is shown in Figure 1-6.

See Appendix F for optional configurations.

Figure 1-6 Keyboard

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T3400/T3400CT Maintenance Manual

1.6 Monochrome LCD

The monochrome LCD is composed of an LCD module, a Fluorescent Lamp (FL), and an

FL inverter board.

1.6.1 Monochrome LCD Module

The T3400 monochrome LCD supports 640 x480 pixels with a video controller and 64

levels of gray. The video controller includes the functions of the VGA and SVGA.

The LCD receives vertical and horizontal synchronizing signals, 8-bit data signals (4-bit

upper block data signal and 4-bit lower block data signal), and shift clock for data transmis-

sion. All signals are CMOS-level compatible.

The sidelit LCD is shown in Figure 1-7 and its specifications are provided in Table 1-3.

Figure 1-7 Monochrome LCD

Table 1-3 Monochrome LCD Specifications

Item Specifications

Number of dots (dots) 640 x 480

Dot pitch (mm) 0.24 (W) x 0.24 (H)

Display area (mm) 176.8 (W) x 132.6 (H)

Contrast 18:1 (typically)

FL current (mA) 4.0 (full-power mode)

FL frequency (KHz) 44

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