Toshiba T-Series T1200 User manual

1.1 GENERAL
Toshiba Personal Computer T1200 (hereinafter referred to as
T1200) is a portable personal computer which is compatible with
IBM PC situated at higher rank of portable computer than Toshiba
TllOO PLUS. It provides many powerful functions in spite of its
compact size and internal battery pack which is removal.
Hardware of the T1200, most of IC chips are C-MOS type so that
the power consumption is very little and Gate Array chips are
applied so that it is very compact and light weight.
The Tl200 is composed of as follows:
System PCB (Printed curcuit board)
3.5-inch floppy disk drive
3.5-inch hard disk drive
LCD (Liquid crystal display)
Keyboard
Intelligent power supply PCB
Built-in modem
FIGURE 1-1 T1200 Personal Computer
1-1

A 3.5-inch Floppy disk drive (FOO) is double-sided,
double-density, double-track with storage capacity of 720
kilobytes (formatted). A 3.5-inch hard disk drive (HOD) with
storage capacity of 20 megabytes is an equipment of the former.
The high-resolution liquid crystal display (LCD) with pixels of
640 in columns and 200 in rows.
The keyboard has 82 keys. For most applications it can be used
exactly like a standard typewriter keyboard.
Intelligent power supply apart from those ordinary power serving
functions, this unit contains a so-called "one-chip
microcomputer", and it controls the whole system PCB, FOO, HOD
and HOC.
The built-in modem expands the capabilities of your system. The
built-in modem enables the system to communicate with an
asynchronous communications device through a telephone line. The
modem can operate communications at either low (300 bps) or high
(1200 bps) speed.
The T1200 provided connecting to the optional devices at the
rear panel of the system. There are six connectors such as a
parallel printer, an RGB direct drive CRT display, an external
FOO, an external key pad and an RS-232C device.
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1.2 SYSTEM PCB
System PCB is composed of the following devices:
o Central processor: CPU (80C86-2) (9.54 MHz/4.77 MHz)
o Numeric data processor: NPU (8087, optional)
o Memory
System memory
Expanded memory
BIOS ROM
Video RAM
640 kbytes
384 kbytes
32 kbytes
16 kbytes
o System support elements
Direct memory access: DMA (82C37)
Timer : (82C53)
Programmable interrupt controller: PIC (82C59)
o Floppy disk controller: FDC (8565)
o Keyboard controller: KBC (80C49)
o Acynchronous communication element: ACE (8570)
o Gate array
Bus driver
Bus controller
EXP-MEM controller
Display controller
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1.2.1 Jumper straps
The system PCB has five jumper straps~ PJ17, PJ18, PJ19, PJ20,
and PJ2l.
The following figure shows location of the jumper straps.
I PJ21
PJ18 PJ19
--
PJ20
I11III
PJ17
-
FIGURE 1-2 Jumper Straps Location
1-4

The following table shows function of the jumper straps.
TABLE 1-1 Jumper Strap Functions
Jumper Pins Description
D
F/F type
PJ17
1 2
F/H type
PJ18
D 3 Normal.
PJ18 PJ19 1 2
PJ19
PJ18
1 G When connect an
ICE to the co-processor socket.
PJ19D
D Noco-processor.
PJ20
1 2 When connect a co-processor
to the co-
processor socket.
D Display a normal
font.
PJ21
1 2 Displays a North Europian (Denmark) font.
1-5

1.3 3.5-rRCB PLOPPY DISK DRIVE
The floppy disk drive (FDD) used in the T1200 is high
performance, high reliable, slim sized FDD for 3.5-inch floppy
disks with recording capacity of 1 Mbyte (unformatted) in
double-sided, double density and 135 tracks per inch operation.
The specifications are as following table.
FIGURE 1-3 3.5-inch FDD
T~BLE 1-2 3.5-inch Floppy Disk Drive Specifications
Item Specifications
Storage Capacity (kilobytes)
1000 (unformatted)
720 (formatted)
Number of Heads 2
Number of Track perSide
80
Track to Track Access (milliseconds) 6
Head Settling Time (milliseconds) 1S
Track Density (tracks persecond) 135
Motor Start-up Time (milliseconds)
500
Data Transfer Rate (kilobits per second) 250
Rotational Speed (revolutions per minute)
300
Recording Method
MFM (Modified frequency
modulation)
1-6

1.4 HARD DISK DRIVE
The hard disk drive (HDD) is random access storage, having
recording capacity of 20 Mbytes. This is equipped with the
storage media of non-removable 3.S-inch magnetic disks and
mini-winchester type magnetic heads.
The specifications are as following table.
FIGURE 1-4 3.5-inch Hard Disk Drive
TABLE 1-3 3.5-inch Hard Disk Drive Specifications
Item Specifications
Storage Capacity (megabytes) 25.3
(unformatted)
21.4 (formatted)
Number of Heads 2
Number
of Track perSide 615
Access Time (milliseconds) (minimum) 24
(average) 78
(maximum) 130
Data Transfer Rate (megabits per second) 7.5
Rotational Speed (revolutions per minute) 2597
Recording
Method
2-7 RLL (Run length limited)
1-7

1.5 BARD DISK COR~OL PCB
Hard disk control PCB (HOC) is accompanied by hard disk drive
(HOD) and connects to the system PCB through a cable. This HOC
can interface the HOD to the system PCB.
The specifications are as following table.
FIGURE 1-5 Hard Disk Control PCB
TABLE 1-4 Hard Disk Control PCB Specifications
Item
Specifications
Encoding method 2-7 RLL (Run Length Limited)
Data Transfer Rate (megabits per second) maximum
7.S
Write Precompensation time (nanoseconds) 12
Sectorina Soft
1-8

1.6 KEYBOARD
The keyboard is mounted on the system and has 82 keys. These
consist of 48 standard keys, 10 function keys, 10 cursor keys,
13 functional keypads, and Fn key.
The keyboard is just a key matrix built up by the above keys.
The keyboard is connected to the keyboard controller on the
system PCB through a 22-pin flat cable.
FIGURE 1-6 Keyboard
1-9

1.7 LIQUID CRYS~AL DISPLAY
The liquid crystal display (LCD) is a graphics type display unit
which has a resolution of 640 in horizontal (or column) by 200
in vertical (or row) directions. This unit is composed of the
display panel, power supply and driver circuits. This receives
timing pulses, four-bit data signals, +5V dc and -22V dc power
inputs and a contrast control input from the system PCB. All
timing pulses and data signals are TTL level compatible.
Specifications are as following table.
FIGURE 1-7 Liquid Crystal Display
TABLE 1-5 Liquid Crystal Display Spesifications
Item Specification
Outline Dimension (mm) 275.0 (W) x 126.0 (H) x 15.8(D)
Number
of Dots 640 x 200
dots
Number of characters 80 x 25 (2000) Characters
(8 x 8
dot format, alpha-numeric)
Clear Viewing Area (mm) 231.0 (W) x 105.0 (H)
Dot Size (mm) 0.32 (W) ,0.46 (H)
Dot Pitch (mm) 0.35 (W)
,0.49 (H)
Weight (gram) Max.
500
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