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