Toshiba T4400SXC User manual

1.1 General
The Toshiba T4400SXC Personal Computer uses extensive Large Scale Integration (LSI), and
Complementary
Meta1~Oxide Semiconductor (CMOS) technology to provide minimum size
and weight, low power usage and high reliability. The T4400SXC incorporates the following
features and benefits:
o ~croprocessor
TheT4400SXC uses an 80486SX-25 microprocessor that operates at 25 MHz.
o Math co-processor
TheT4400SXC comes with a built-in socket for an 80486DX-25 which has a
Numeric DataProcessing Unit (NDP).
o Cache memory
The T4400SXC has an 8 KB cache memory which is stored in the 80486SX
microprocessor.
o Disk storage
TheT4400SXC has an internal 80 or 120 Megabyte (MB) Hard DiskDrive
(HDD) with an average access time
of 19 milliseconds. A 3.5-inchFloppy Disk
Drive (FDD) supports 2HD floppy disks (1.44 Mbytes) and 2DD floppy disks
(720 Kbytes).
o Memory
TheT4400SXC comes standard with 4 MB
of CMOS Random Access Memory
(RAM). This includes 640 KB
of conventional memory and 3,456 KB of
extended memory which can be utilized as expanded memory compatible with
the Lotus/lntel/Microsoft Expanded Memory Specifications (LIM-EMS).
o TFf color LCD
A high resolution Liquid Crystal Display (LCD) 640x480 pixels 512 colors for
both graphics and characters.
The T4400SXC internal display controller supports Video Graphics Adapter
(VGA) functions on the internal display devices.
o Keyboard
An easy to use 82/84-key keyboard with full-size keys and standard spacing is
compatible with IBM standard software.
(] Batteries
The T4400SXC has three different batteries: a main battery, a backup battery,
and a Real Time Clock (RTC) battery.
o Expansion port
TheT4400SXC has one unique 150-pin expansion port.
o Parallel port
A centronics compatible parallel interface port serves two purposes. The port
can be used to connect a centronics compatible printer or an external floppy disk
drive.
(] RS-232-C port
The T4400SXC has one 9-pin serial interface port.
1-5

1-6
o Tenkey port
The T4400SXC has a tenkey pad interface connector on the left side that can be
connected to an external tenkey pad.
o Mouse port.
The T4400SXC has one 6-pin mouse port on the back that can be connected to
an
mM PS/2 mouse.
o RGB port
The T4400SXC has one I5-pin ROB port on the back that can be connected to an
external video display.

The T4400SXC Personal Computer is shown in figure 1-1. Its system configuration is shown
in figure 1-2.
Battery pack
Figure 1-1 T4400SXC system unit
PJ27 PJ19
PJ4
PJ5
PJ17
PJ18 PJ14 PJ9
Built-in modem
RS-232-C
PJ7 PJ25
PJ13
I--!--....I
PJ12I--+---I
PJ21----I Sub battery
PJ1 ~--I RTC battery
PJ3
Figure 1-2 System unit configuration
1-7

.....
Co
"-':I
ciQ'
c
~ ~
I
(M
t=
~
~
Co
;'
(JQ
r3
S
...--
LA23·17
----------~~~----------------------::::============:::::::::::g~~.1~7::~
SA19·0
SAUI·O
SOls.o
OSC
(20M)
CLKGEN
SOls.o
l.J
l
~=~-""l~
25M
44.9M
~
EXP
,
24M
28.322M
-=-,5:.0
A1'.M..5.
HOD
I/F
--
HOD
;
14.745M
25.175M
Dul
14.318M
l---'"
FY4H01
32.768K
RTC
BACK
UP
BATTERY
PVGA1
F
~
-.J
RAMV-
1:1->-=--
__
----1
PS/2
MOUSE
1r:i)8~~
KBC
-IEiIl TENKEY
RAMV-~
LJ
D
RAMV-~
:::>
80PIN
KB
L..-
___
----I
GA
~
I
ED
t----mIiD PANEL ONIOFF
SYS-
LA23·17
FY4LE2
CONT
FDD
CPU
A23.2
344PIN
SI
SERIAL
80486SXI
S015.0
'=>
T9901'1 P PRT/FDD
(EXP)
80486DXf-.-.,Q,31~
L
20BPIN
(*1) :
DMA
x 2
(25MHz)/
PIC
x 2
P23T
SA19.0
~
PIT
x 1
r-
-
SIOx2
~s
SPEAKER
FDC
x 1
L...-
__
..... I
VFO
x 1
-B-I-O-S-
....
I(
S015-O
~
~~KUP
ROM
L---I
r----
32K
x B
12BKxB V
SA19-O
1.
r
~
.....
RAMV
II
~
+5V
(VCC)
............
-S-Y-S--...,L----J
uBUILT-INMOOEM
I
~
~5V
(RAMV)
+--OCIN
r
RAM
~
~TYPEE
.
-<~
~12V
+--MAINBATTER'
512KxB
L.
RAMV
T E
+--BACKUPBAn
MEMORY
JiJV
~
(DRAM
CARD)
t;
PS
031-0
~
-'
~~~1~
~r=S=P=V===-
__
.J
:!1
I-l
(1Q
N
a
....
I
Vl
1-3
~.
:r'
V)
~
nl
a-
00
-
~
g
~
-
~
nl
&.
9
~
~
~
a =
....
-
0 =
......
...
-
::r 0
0
t")
t
~
~
8
_.
D)
en
(fQ
><
..,
(") D)
V)
9
'<
V)
...
0
3
c:
~.

The T4400SXC system board shown in figure 1-3 is composed of the following major
components:
o An 80486SX-25 CPU
o Super Integration (SI) T9901, which stores the following components:
• Two Direct Memory Access Controller (DMAC):
• Two Programmable Interrupt Controller (PIC):
• One Programmable Interval Timer (PIT):
• One Floppy Disk Controller (FDC):
• One Serial Input/Output controller (SIO):
• One Variable Frequency Oscillator (VFO):
• One I/O Controller
o A Real Time Clock (RTC): 146818AF
o A KeyBoard Controller (KBC): M37452M4
o A Power Supply Controller (PSC): 47C660
o The following memories:
Standard RAM: 4MB
82C37
82C59
82C54
TC8565
TC8570
TC8568
Cash memory 8 KB (inside CPU)
Backup RAM:
32KB
BIOS ROM: 128 KB (96 KB are used)
This ROM contains Initial Reliability Test (IRT), Basic
Input/Output System (BIOS), and video BIOS.
Video RAM: 256KB
Optional memory cards expand memory to a maximum of 20 MB.
o System control gate array :
o VGA display controller:
SYS CNT-GA (344-pin)
PVGA1F: WD90C30 (132-pin)
o The following Oscillators (OSC):
• 24 MHz OSC
(Xl) is used for the FDC and VFO.
• 25.0 MHz OSC (X2) is used for the CPU.
• 14.7456 MHz OSC (X6) is used for the COM.
• 14.31818 MHz OSC (X7) is used for the KBC.
• 32.768 KHz OSC (X8) is used for the RTC.
1-9

1.3 The T4400SXC 3.S-inch Floppy Disk Drive
"'-.<- .... ~~~~_,_.~Tht- .. I-4400SX..c~3._'\:.iJlr.]3,F.JappyDiskDrivJ" ... f:FDn~js...a..tbin_bie.h-!1""rlOl1Jlan~ereli~hl~prjllf",_=-=-=c--_-----=--:------c=:-~~.",- .... ·
that supports 720-KB (fonnatted) 2DD and 1.44-MB (fonnatted) 3.5-inch floppy disk.
The T4400SXC 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

1.4 The T4400SXC 2.S-inch Hard Disk Drive
The T4400SXC's 80-MB or 120-MB (formatted) 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.
The T4400SXC HDD is shown in Figure 1-5. Specifications for the HDD are described in
Table 1-2.
Figure I-S 2.S-inch HDD
Table 1-2 2.S-inch HDD specifications
80 MB (CP-2084) 120
MB (CP-2124) 120 MB (MK2124FC)
Storage capacity (MB)
Formatted 85.4 121.6 130.1
Number of disks 2 2 2
Data heads 4 4 4
Data surfaces 4 4 4
Track per surface 1,097 1,123 1,155
Sectors per track 38 (+1) 53 (+1) 55 (+1)
Bytes per sector 512 512 512
Access time (ms)
Track to track 5 3 5
Average 19 16 17
Maximum 40 40 36
Rotation speed (rpm) 3,486 3,486 3,200
Data transfer rate (bps)
Tolfrom media
1.5M 2.2M 6.5M
Interleave
1:1 1:1 1:1
Recording method 2-7 RLU1-7 RLL 2-7 RLU1-7 RLL 1-7 RLL
1-11

1.5 The Keyboard
The 82-(USA) or 84-(European) keyboard is mounted on the T4400SXC's system unit The
keyboard is connected to the keyboard controller on the system board through 19-pin flat
cables. The keyboard is shown in Figure 1-6.
See Appendix E for optional keyboard configurations.
Figure 1-6 Keyboard
1-12

1.6 TFT Color LCD Display
The TFf Liquid Crystal Display (LCD) contains an LCD module, a Fluorescent Lamp (FL),
and FL inverter board.
1.6.1 LCD Module
The T4400SXC TFf color LCD is illuminated from the side and supports 640x480 pixels
with High Resolution Graphics Subsystem (HRGS) and 512 colors for graphics and
charactors. This HRGS includes the functions
of Video Graphics Array (VGA).
The LCD receives vertical and horizontal synchronizing signals, 8-bit data signals (4-bit
upper data signal, 4-bit lower data signal), and shift clock for data transmission. All signals
are CMOS-level compatible.
The
TFf LCD is shown in Figure 1-7. The specifications for the LCD are described in Table
1-3.
Figure 1-7 TFT LCD
Table
1-3 TIT LCD specifications
Item Specifications
Number of dots (dots) 640x480
Dot pitch (mm) 0.27(W)xO.27(H)
Display area (mm) 171(W)x13O(H)
Contrast 60:1 (typ.)
FL current (mA) 4.5 to 5.5
FL frequency (KHz) 20 to 60
1-13

1.6.2 Fluorescent Inverter Board
The FL inverter board supplies high frequency current to light the LCD's Fluorescent Lamp
The specifications for the
FL inverter are described in Table 1-4.
Table 1-4 FL inverterspecifications
Item
Specifications
Input Voltage (V) 18
Power (W) 5.6
Output Voltage (V) 1100 (rrns) (Max.)
Current (rnA) 5.0x2
Frequency (KHz)
4.7
Bounds of current (rnA) 2.8 to 5.0
1-14