Toshiba T4700CS User manual

T4700CS, T4700CT, T4800CT 1-1

1.1 Features

The Toshiba T4700CS/T4700CT/T4800CT is one of the lightest and most advanced portable

computers available. Utilizing advanced technology and high-speed components, the

T4700CS/T4700CT/T4800CT offers excellent color display legibility, battery operation and

IBM PC/AT compatibility. The T4700CS/T4700CT/T4800CT system unit consists of the

following features:

❑Microprocessor

The T4700CS/T4700CT uses an SL Enhanced Intel 486TMDX2 Microprocessor

(referred to as 486DX2 in this manual) that operates at 50 MHz, 3.3 Volts.

The T4800CT uses an SL Enhanced Intel 486TMDX4 Microprocessor (referred to as

486DX4 in this manual) that operates at 75 MHz, 3.3 Volts.

❑Math co-processor

The T4700CS/T4700CT has a math co-processor which is stored in the 486DX2.

The T4800CT has a math co-processor which is stored in the 486DX4.

❑Cache memory

The T4700CS/T4700CT has an 8 KB cache memory which is stored in the 486DX2.

The T4800CT has an 16-KB cache memory which is stored in the 486DX4.

❑Disk storage

The T4700CS/T4700CT has an internal 200- or 320-Megabyte (MB) Hard Disk Drive

(HDD) with an average access time of 12 milliseconds. A 3.5-inch Floppy Disk Drive

(FDD) supports 2HD floppy disks (1.44 Mbytes) and 2DD floppy disks (720 Kbytes).

The T4800CT has an internal 320 or 500 MB HDD with an average access time of 12

milliseconds. A 3.5-inch FDD supports 2HD floppy disks (1.44 Mbytes) and 2DD

floppy disks (720 Kbytes).

❑Memory

The T4700CS/T4700CT/T4800CT comes standard with 8 MB of CMOS Random

Access Memory (RAM) 3.3 Volts. This includes 640 KB of conventional memory and

7,424 KB of extended memory which can be utilized as expanded memory compatible

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

1-2 T4700CS, T4700CT, T4800CT

❑STN color LCD (T4700CS)

A high-resolution 9.5-inch full-color, Supertwist Nematic (STN) color Liquid Crystal

Display (LCD) displays 640x480 pixels with 226,981 colors for both graphics and

characters. The T4700CS internal display controller supports Video Graphics Array

(VGA) functions on the internal display devices.

The T4700CS internal display controller supports Video Graphics Adapter (VGA)

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

display.

❑TFT color LCD (T4700CT/T4800CT)

A high-resolution 9.5-inch full-color, Thin Film Transistor (TFT) color LCD displays

640x480 pixels.

The T4700CT/T4800CT internal display controller supports VGA functions on the

internal display and SVGA functions on the external display.

❑Keyboard

An easy-to-use 82/84-key enhanced keyboard with full-size keys and standard spacing

is compatible with IBM standard software.

❑Batteries

The T4700CS/T4700CT/T4800CT has three different batteries: a main battery, a

backup battery, and a Real Time Clock (RTC) battery.

❑Status indicator panel

The T4700CS/T4700CT/T4800CT has a status indicator panel. It is a liquid crystal

display (LCD) panel which displays battery charge indicator and 11 icons indicating

the system status.

❑Memory card slot

The T4700CS/T4700CT/T4800CT has one Toshiba optional memory card slot, which

enables you to install a Toshiba optional memory card.

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

The T4700CS/T4700CT/T4800CT has two PCMCIA slots, which enable you to

install a MiNC Toshiba card modem or other industry standard PCMCIA release 2.0

card.

T4700CS, T4700CT, T4800CT 1-3

❑Expansion port

The T4700CS/T4700CT/T4800CT has one unique 150-pin expansion port, which

attaches to a Desk Station IV.

❑PRT/FDD port

T4700CS/T4700CT/T4800CT’s Centronics compatible 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 T4700CS/T4700CT/T4800CT has one 9-pin serial interface port.

❑Mouse port

The T4700CS/T4700CT/T4800CT has one 6-pin mouse port on the back that can be

connected to an IBM PS/2 mouse.

❑Keyboard port

The T4700CS/T4700CT/T4800CT has one 6-pin keyboard port on the back that can

be connected to an IBM PS/2 keyboard.

❑Microsoft BallPoint mouse V2.0 with QuickPort connection (BPQP2)

The T4700CS/T4700CT/T4800CT has one BPQP2 port on the right.

❑RGB port

The T4700CS/T4700CT/T4800CT has one 15-pin RGB port on the back that can be

connected to an external video display.

❑Audio ports

• Headphone, standard 3.5 mm diameter miniature stereo jack with

speaker shutoff switch.

Use a headphone with an impedance of 16W.

• Microphone, standard 3.5 mm diameter miniature monaural jack.

1-4 T4700CS, T4700CT, T4800CT

The T4700CS/T4700CT/T4800CT Personal Computer is shown in figure 1-1. The system

configuration is shown in figure 1-2.

Figure 1-1 T4700CS/T4700CT/T4800CT personal computer

Figure 1-2 T4700CS/T4700CT/T4800CT system unit configuration

T4700CS, T4700CT, T4800CT 1-5

1.2 System Unit Block Diagram

Figure 1-3 is a block diagram of the T4700CS/T4700CT/T4800CT system unit.

Figure 1-3 T4700CS/T4700CT/T4800CT system board block diagram

1-6 T4700CS, T4700CT, T4800CT

The T4700CS/T4700CT/T4800CT system board shown in figure 1-3 is composed of the

following major components:

❑ A 486DX2-50 (T4700CS/T4700CT) CPU, which incorporates a math co-

processor and 8 KB cache memory.

A 486DX4-75 (T4800CT) CPU, which incorporates a math co-processor and

16 KB cache memory.

❑The following memory components:

Standard RAM: 8 MB, 32-bit data width (70 ns)

Cache memory: 8 KB (inside a 486DX2-50 CPU)

16 KB (inside a 486DX4-75 CPU)

System, Video, 128 KB (96 KB are used), 8-bit data width

BIOS: A 1-Mbit flash ROM is used (150 ns).

This ROM contains Initial Reliability Test (IRT), Basic Input/

Output System (BIOS), and video BIOS.

Video RAM: 1 MB, 16-bit data width.

Two 256Kx16 bit chips are used.

Memory card: 4, 8, or 16 MB memory card can be installed.

32-bit data width.

❑ Super Integration (SI) T9901, which stores the following components:

•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 I/O Controller

•One Printer Port Controller

•One Speaker Controller

❑ A Real Time Clock (RTC)

One T9934 chip is used. The T9934 has 128 of bytes memory. Fourteen bytes

memory are used for the calendar and clock. The remaining 114 bytes are used for the

system configuration data.

❑ A 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, external keyboard port, PS/2 mouse port,

and BPQP2 port.

T4700CS, T4700CT, T4800CT 1-7

❑VGA display controller: WD90C24A (208-pin)

This controller controls internal and external VGA compatible display and external

SVGA compatible display with Analog Digital Converter (DAC). It can display data

on the internal and external display at the same time and operates at 3.3 volts.

❑Sound Controller

One AD1848 chip is used. The AD1848 controls the internal sound system.

❑Clock Generator receives 14.31818 MHz (X1) and generates the following frequen-

cies:

•25 MHz for the CPU (CPU operates 50MHz[T4700CS/T4700CT] or

75MHz [T4800CT])

•14.7456 MHz for the COM

•24 MHz for the FDC and VFO

•16 MHz is used for GA

•14.31818 MHz for WD90C24A (for VGA)

OSC (X3) generates 32.768 KHz for RTC.

❑Gate Array

System Controller Gate Array

This gate array has following functions:

•CPU Controller

-SMI Controller

-CPU Clock Controller

•Memory Controller

-DRAM Controller

-Compatible Bus Interface Controller

•Bus Controller

-Compatible Bus Interface Controller

-Compatible Access Controller

-DMAC Controller

-I/O Controller

•Address Latch Controller

-32-Bit to 16-Bit Controller

-Address Latch

-DMA Address Generator

-Refresh Address Generator

•I/O Register

-Compatible I/O Port Register

-Saving the data of the Register (in resume) Controller

-Toshiba Special Register

1-8 T4700CS, T4700CT, T4800CT

•Processing Speed Controller

•Data Latch

•Suspend/Resume Controller

Sub LCD Controller Gate Array

This gate array has following functions:

•Status Indicator Panel Controller

-LCD Segment Flashing Controller

•Internal Communication Controller

-KBC/Power Supply Micro Processor/Main CPU Communication

Controller

-KBC/Power Supply Micro Processor Interrupt Controller

IC Card Controller Gate Array

This gate array has following functions:

•IC Card Controller

-PCMCIA IC Card Controller

-Toshiba Modem Card Controller

•EEPROM (for security) Controller

-KBC-Security-EEPROM Communication Controller

•Others

-KBC Communication Controller

-Disable the PRT/FDD Port, HDD Access Controller

-EEPROM (for BIOS) Access Mode Controller

-Sound System Access Controller

T4700CS, T4700CT, T4800CT 1-9

1.3 3.5-inch Floppy Disk Drive

The T4700CS/T4700CT/T4800CT 3.5-inch Floppy Disk Drive (FDD) is a thin, high-perfor-

mance reliable drive that supports 720-KB (formatted) 2DD and 1.44-MB (formatted) 2HD

3.5-inch floppy disks.

The T4700CS/T4700CT/T4800CT FDD is shown in figure 1-4. The specifications for the

FDD are described 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)

1-10 T4700CS, T4700CT, T4800CT

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.

T4700CS/T4700CT supports the 200 MB and 320 MB. T4800CT supports the 320 MB and

500 MB.

The T4700CS/T4700CT/T4800CT HDD is shown in figure 1-5. Specifications for the HDD

are described in table 1-2.

Figure 1-5 2.5-Inch HDD

Table 1-2 2.5-inch HDD specifications

200 MB 320 MB 500 MB

(MK2224FC) (MK2326FC) (MK2428FC)

Storage capacity (MB)

Formatted 213.0 320.0 524.0

Number of disks 2 3 4

Data heads 4 6 8

Data surfaces 4 6 8

Track per surface 1,560 1,830 1,920

Bytes per sector 512 512 512

Access time (ms)

Track to track 3 3 3

Average 12 12 12

Maximum 25 25 25

Rotation speed (rpm) 4,000 4,200 4,000

Data transfer rate (bps)

To/from media 18.9 to 31.6 M 18.7 to 29.6 M 18.9 to 31.6 M

Interleave 1:1 1:1 1:1

Recording method 1-7 RLL 1-7 RLL 1-7 RLL

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