Toshiba T-Series T4900CT Bedienungsanleitung

T4900CT

1-1

1.1 Features

The Toshiba T4900CT is one of the lightest and most advanced portable computers available.

Utilizing advanced technology and high-speed components, the T4900CT offers excellent

color display legibility, battery operation, and IBM PC/AT compatibility. The T4900CT

system unit consists of the following features:

❑Microprocessor

The T4900CT uses an Intel PentiumTM Processor (referred to as Pentium in this

manual) that operates at 75 MHz, 3.3 Volts.

❑Math co-processor

The T4900CT has a math co-processor which is stored in the Pentium.

❑Cache memory

The T4900CT has a writeback type 16 KB cache memory which is stored in the

Pentium. The 16 KB cache consists of an 8 KB instruction cache and an 8 KB data

cache.

❑Disk storage

The T4900CT has an internal 2.5-inch 810 MB HDD. A 3.5-inch FDD supports 2 HD

(1.44 MB) floppy disks and 2DD (720 KB) floppy disks.

❑Memory

The T4900CT comes standard with 8 MB of CMOS type Dynamic Random Access

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

7,360 KB of extended memory which can be utilized as expanded memory compatible

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

❑TFT color LCD

The T4900CT has a high-resolution 10.4-inch full-color, Thin Film Transistor (TFT)

color LCD that displays 640 x 480 pixels.

The T4900CT internal display controller supports VGA functions on the internal

display and SVGA functions on an 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. The T4900CT’s keybard supports soft-

ware that used a 101/102-key enhanced keyboard.

1-2

T4900CT

❑Batteries

The T4900CT has three different batteries: a main battery, a backup battery, and a

Real Time Clock (RTC) battery.

❑Status indicator panel

The T4900CT has a status indicator panel. It is a liquid crystal display (LCD) panel

which displays a battery charge indicator and 11 icons indicating the system status.

❑Memory card slot

The T4900CT has one optional memory card slot, which enables you to install an

optional memory card.

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

The T4900CT has two PCMCIA slots, which enable you to install a MiNC Toshiba

card modem or other industry standard PCMCIA release 2.0 card. These slots are a

type II (5mm) and type III (10.5mm) card thickness.

❑Expansion port

The T4900CT has one unique 150-pin expansion port, which attaches to a Desk

Station IV.

❑RS-232C port

The T4900CT has one 9-pin serial interface port.

❑PRT port

The T4900CT’s Centronics compatible parallel interface port serves two purposes

and can be used to connect a Centronics compatible printer.

❑Mouse port

The T4900CT has one 6-pin mouse port on the back that can be connected to an IBM

PS/2 mouse.

❑Keyboard port

The T4900CT has one 6-pin keyboard port on the back that can be connected to an

IBM PS/2 keyboard.

T4900CT

1-3

❑RGB port

The T4900CT 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 shut-off

switch.

•Use a headphone with an impedance of 16W.

•Microphone, standard 3.5 mm diameter miniature monaural jack.

❑Accu point

The T4900CT pointer control stick, located in the center of the keyboard, provides

convenient control of the cursor without requiring desk space for a mouse.

1-4

T4900CT

The T4900CT Personal Computer is shown in figure 1-1. The system configuration is shown

in figure 1-2.

Figure 1-1 T4900CT personal computer

Figure 1-2 T4900CT system unit configuration

T4900CT

1-5

1.2 System Unit Block Diagram

Figure 1-3 is a block diagram of T4900CT system unit.

Figure 1-3 T4900CT system board block diagram

1-6

T4900CT

The T4900CT system board shown in figure 1-3 is composed of the following major compo-

nents:

❑A pentium processor, which incorporates a math co-processor and16 KB cache

memory.

❑The following memory components:

Standard RAM: 8 MB, 64-bit data width (70 ns)

Cache memory: Total 16 KB (inside a Pentium)

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, 16, or 32 MB memory card can be installed.

32-bit data width.

❑Super Integration (SI) T6W23, 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): 16550

•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 bytes of memory. Fourteen bytes of

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 pointing stick.

❑VGA display controller: F65545 (208-pin)

3.3 volt operation. 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.

T4900CT

1-7

❑Sound Controller

Windows Sound System compatible sound unit is used. One AD1848 chip supports

PCM sound, and YMF262 (OPL3) with YAC512 (DAC) supports FM synthesizer

sound.

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

cies:

•50 MHz for the CPU (CPU operates 75MHz)

•14.7456 MHz for the COM

•24 MHz for the FDC and VFO

•16 MHz is used for GA

•14.31818 MHz for Video Controller

OSC (X3) generates 32.768 KHz for RTC.

❑Gate Array

System Controller Gate Array

This gate array has the following functions:

•CPU Controller

-SMI Control

-CPU Clock Control

•Memory Controller

-64-bit bus memory control (standard DRAM area)

-32-bit bus memory control (expansion memory area)

•Bus Controller

-64 to/from 32-bit data path width convert

-32-bit local bus control

•Address Latch Controller

-Address convert

-Address Latch

•I/O Register

-Register re-storing for resume

-Special Register

•Processing Speed Controller

1-8

T4900CT

ISA Bus Controller Gate Array

This gate array has the following functions:

•Bus controller

-32 to/from 16-bit bus width convert

-ISA bus interface control

-ISA bus access control

-DMAC control

-DMA address generate

-I/O control

•Memory Controller

-ISA bus interface control

-Refresh address control

•I/O Register

-ISA compatible bus I/O port

-Special Registers

•Suspend/Resume Controller

Sub LCD Controller Gate Array

This gate array has the following functions:

•Status Indicator Panel Controller

-LCD Segment Flashing Controller

•Internal Communication Controller

-KBC/Power Supply (PS) Micro Processor Interrupt Controller

-KBC/PS microprocessor/Main CPU Communication Controller

IC Card Controller Gate Array

This gate array has the 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

T4900CT

1-9

1.3 3.5-inch Floppy Disk Drive

The T4900CT 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 T4900CT 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 1,475 737

Number of heads 2 2

Number of cylinders 80 80

Access time (ms)

Track to track 3 3

Average 94 94

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

T4900CT

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.

T4900CT supports 810 MB HDD. The T4900CT HDD is shown in figure 1-5. Specifica-

tions for the HDD are described in table 1-2.

Figure 1-5 2.5-Inch HDD

Table 1-2 2.5-Inch HDD specifications

810MB

DVAA-2810

Physical specifications

Formatted capacity (MB) 810.0

Disks 3

Heads 6

Cylinders 1,571

Bytes per sector (bps) 512

Cording 1-7RLL

Performance specifications

Access time (average) 14.5

(track to track) 4

Maximum stroke 23.5

Rotation speed (rpm) 3,800

Data transfer rate (Mbps) 24.9 to 36.0

Power requirement

DC voltages (V) +5 only

Power (typical)

Seek (W) 2.8

Read (W) 2.8

Write (W) 2.8

Standby mode

(Spin only) (W) 0.4

Sleep mode

(Motor off) (W) 0.4

Spin-up mode (mA) 940

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