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Toshiba T4700CS - User Manual

Toshiba T4700CS
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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 486
TM
DX2 Microprocessor
(referred to as 486DX2 in this manual) that operates at 50 MHz, 3.3 Volts.
The T4800CT uses an SL Enhanced Intel 486
TM
DX4 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).

Table of Contents

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Overview

  1. Function Description
  2. Important Technical Specifications
  3. Usage Features
  4. Maintenance Features

The Toshiba T4700CS/T4700CT/T4800CT is a lightweight and advanced portable computer designed with high-speed components and advanced technology, offering excellent color display legibility, battery operation, and IBM PC/AT compatibility.

Function Description

The system unit incorporates a microprocessor, math co-processor, cache memory, disk storage, and various ports for expansion and peripherals. It features different display types depending on the model, a standard keyboard, multiple batteries, and a status indicator panel.

Important Technical Specifications

  • Microprocessor:
    • T4700CS/T4700CT: SL Enhanced Intel 486DX2 Microprocessor, 50 MHz, 3.3 Volts.
    • T4800CT: SL Enhanced Intel 486DX4 Microprocessor, 75 MHz, 3.3 Volts.
  • Math Co-processor: Integrated within the 486DX2 (T4700CS/T4700CT) or 486DX4 (T4800CT).
  • Cache Memory:
    • T4700CS/T4700CT: 8 KB cache memory (within 486DX2).
    • T4800CT: 16 KB cache memory (within 486DX4).
  • Disk Storage:
    • Hard Disk Drive (HDD):
      • T4700CS/T4700CT: Internal 200-MB or 320-MB HDD, 12 milliseconds average access time.
      • T4800CT: Internal 320-MB or 500-MB HDD, 12 milliseconds average access time.
      • HDD specifications (e.g., for 500 MB MK2428FC): 524.0 MB formatted capacity, 4 disks, 8 data heads, 8 data surfaces, 1,920 tracks per surface, 512 bytes per sector, 12 ms average access time, 4,000 rpm rotation speed, 18.9 to 31.6 M bps data transfer rate, 1:1 interleave, 1-7 RLL recording method.
    • Floppy Disk Drive (FDD): 3.5-inch FDD supporting 2HD (1.44 Mbytes) and 2DD (720 Kbytes) floppy disks.
      • FDD specifications (2-MB mode): 2,000 KB unformatted, 1,311 KB formatted, 2 heads, 80 cylinders, 3 ms track-to-track access, 181 ms average access, 15 ms head settling time, 135 tpi recording track density, 500 Kbps data transfer rate, 300 rpm rotation speed, Modified Frequency Modulation (MFM) recording method.
  • Memory:
    • Standard RAM: 8 MB CMOS RAM (3.3 Volts), including 640 KB conventional memory and 7,424 KB extended memory (LIM-EMS compatible).
    • Standard RAM: 8 MB, 32-bit data width (70 ns).
    • System, Video, BIOS: 128 KB (96 KB used), 8-bit data width.
    • BIOS: 1-Mbit flash ROM (150 ns) containing Initial Reliability Test (IRT), Basic Input/Output System (BIOS), and video BIOS.
    • Video RAM: 1 MB, 16-bit data width (two 256Kx16 bit chips).
    • Memory card: 4, 8, or 16 MB memory card can be installed, 32-bit data width.
  • Super Integration (SI) T9901: Includes two DMACs (82C37), two PICs (82C59), one PIT (82C54), one FDC (TC8565), one SIO (TC8570), one VFO (TC8568), one I/O Controller, one Printer Port Controller, one Speaker Controller.
  • Real Time Clock (RTC): T9934 chip with 128 bytes memory (14 bytes for calendar/clock, 114 bytes for system configuration).
  • Keyboard Controller (KBC): M37452M4 chip controlling internal keyboard, external keyboard port, PS/2 mouse port, and BPQP2 port.
  • VGA Display Controller: WD90C24A (208-pin) for internal/external VGA and external SVGA compatible displays, operates at 3.3 volts.
  • Sound Controller: AD1848 chip for internal sound system.
  • Clock Generator: Receives 14.31818 MHz (X1) and generates frequencies for CPU (25 MHz for 50MHz/75MHz operation), COM (14.7456 MHz), FDC/VFO (24 MHz), GA (16 MHz), WD90C24A (14.31818 MHz). OSC (X3) generates 32.768 KHz for RTC.
  • Gate Array: System Controller Gate Array (CPU, Memory, Bus, Address Latch, I/O Register controllers), Sub LCD Controller Gate Array (Status Indicator Panel, Internal Communication controllers), IC Card Controller Gate Array (IC Card, EEPROM, KBC Communication, PRT/FDD Port, HDD Access, BIOS Access Mode, Sound System Access controllers).
  • Display:
    • STN Color LCD (T4700CS): 9.5-inch full-color, Supertwist Nematic (STN) LCD, 640x480 pixels, 226,981 colors. Internal display controller supports VGA functions on internal display, and SVGA on external display.
      • STN LCD specifications: 640x480 dots, 0.3(W)x0.3(H) mm dot pitch, 195(W)x147(H) mm display area, 18:1 contrast (typically), 6.0 mA FL current, 47 KHz FL frequency.
      • STN FL Inverter Board specifications: 18 VDC input voltage, 4.17 W input power, 1,100 VAC output voltage, 6.0 mA output current, 47 KHz output frequency.
    • TFT Color LCD (T4700CT/T4800CT): 9.5-inch full-color, Thin Film Transistor (TFT) LCD, 640x480 pixels, 512 colors. Internal display controller supports VGA functions on internal display, and SVGA on external display.
      • TFT LCD specifications: 640x480 dots, 0.3(W)x0.3(H) mm dot pitch, 192(W)x144(H) mm display area, 60:1 contrast (minimum), 6.0 mA FL current, 47 KHz FL frequency.
      • TFT FL Inverter Board specifications: 18 VDC input voltage, 3 W input power, 1,100 VAC output voltage, 6.0 mA output current, 47 KHz output frequency, 3.0 to 6.0 mA current limits.
  • Keyboard: 82-(USA) or 84-(European) key enhanced keyboard, full-size keys, standard spacing, IBM standard software compatible.
  • Batteries:
    • Main battery: Nickel Metal Hydride, 12 V. 2,400 mAh (T4700CS/T4700CT), 2,600 mAh (T4800CT).
    • Backup battery: Nickel Metal Hydride, 1.2 V, 1,100 mAh.
    • RTC battery: Lithium-Vanadium, 3.0 V, 50 mAh.
  • Power Supply Output Rating:
    • System logic, FDD, HDD: VCC +5V, ±5% tolerance, 2,700 mA max current, 100 mV ripple.
    • RS-232C, Flash ROM: 12V +12V, ±5% tolerance, 120 mA max current, 240 mV ripple.
    • Display: DSPV +9.5 to +23V, 4.02 W.
    • RAM, CPU: B3V +3.3V, ±5% tolerance, 930 mA (T4700CS/T4700CT) / 1,200 mA (T4800CT) max current, 60 mV ripple.
    • RS-232C: M12V -7 to -12.6V, 10 mA max current.
  • Ports:
    • Expansion port: 150-pin, for Desk Station IV.
    • PRT/FDD port: Centronics compatible parallel interface (printer or external 5.25-inch FDD).
    • RS-232C port: 9-pin serial interface.
    • Mouse port: 6-pin, for IBM PS/2 mouse.
    • Keyboard port: 6-pin, for IBM PS/2 keyboard.
    • Microsoft BallPoint mouse V2.0 with QuickPort connection (BPQP2) port.
    • RGB port: 15-pin, for external video display.
    • Audio ports: Headphone (3.5 mm stereo jack, 16W impedance), Microphone (3.5 mm monaural jack).

Usage Features

  • Display Modes: STN LCD (T4700CS) offers 640x480 pixels with 226,981 colors. TFT LCD (T4700CT/T4800CT) offers 640x480 pixels with 512 colors. Both support VGA internally and SVGA externally.
  • Battery Operation: Three types of batteries (main, backup, RTC) ensure portability and data preservation (AutoResume).
  • Status Indicator Panel: LCD panel displaying battery charge, system status icons (11 icons).
  • Memory Card Slot: One Toshiba optional memory card slot.
  • PCMCIA Card Slots: Two slots for industry standard PCMCIA release 2.0 cards (e.g., MiNC Toshiba card modem).
  • Hotkey Functions: Fn+F5 for display device selection, Fn+F1 for instant security mode.
  • Setup Program: Allows configuration of memory, display, COM/PCMCIA/FDD/PRT, hard disk, battery save mode, power-on password, and other settings (CPU cache, speaker volume, boot priority, sound I/O address, external keyboard "Fn" key equivalent).

Maintenance Features

  • Troubleshooting Flowchart: Guides users to identify and resolve malfunctions in FRUs (Power Supply Board, System Board, Floppy Disk Drive, Hard Disk Drive, Keyboard, Display, Status Indicator Panel).
  • Diagnostic Test Programs: TESTCE47/48 programs stored on a Diagnostic Disk to test hardware module functions, including System Test, Memory Test, Keyboard Test, Display Test, Floppy Disk Test, Printer Test, ASYNC Test, Hard Disk Test, Real Timer Test, NDP Test, and Expansion Test.
  • Hard Disk Format Utility: Performs low-level and MS-DOS FORMAT operations, including "All track FORMAT," "Good track FORMAT," "Bad track FORMAT," and "Bad track CHECK."
  • Head Cleaning Utility: Executes head load/seek and read operations for FDD heads (requires cleaning kit).
  • Log Utilities: Logs error information generated during tests into RAM, can be saved to floppy disk or printed.
  • Running Test: Executes a sequence of diagnostic tests continuously.
  • Floppy Disk Drive Utilities: Formats FDDs, copies floppy disks, and displays dump lists for FDD and HDD.
  • BIOS Rewrite Procedures: Steps to update the system BIOS using a BIOS rewriting disk.
  • Password Deletion: Requires obtaining the current password from the owner or contacting Toshiba for security reasons.
  • Disassembly Procedures: Detailed instructions for removing and installing FRUs, emphasizing precautions for static discharge, screw management, and cable connections.
  • LCD Module Handling Precautions: Guidelines for installing, cleaning, and storing the LCD module to prevent damage.

Toshiba T4700CS Specifications

General IconGeneral
BrandToshiba
ModelT4700CS
CategoryLaptop
LanguageEnglish

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