Toshiba T-Series T8500 User manual

File No. 960-012
1.1 GENERAL
Toshiba T8500 is one of the most powerful personal computers
available, offering high technology, high speed and full IBM
PC AT compatibility.
This system unit is composed of Main Board, 3.5-inch floppy
disk drive (FOO) , 3.5-inch hard disk drive (HOD) and power
supply unit.
The system unit has 6 connectors (labeled EX-FOO, PRT, SCSI,
RGB, SERIAL1, and SERIAL2), keyboard socket, 3 IBM PC AT
compatible slots, and 1 slot compatible with Toshiba size
optional card.
The central processing unit (CPU) is the 32-bit 80386-20/25
microprocessor.
The standard memory has a capacity of 2 Mbytes; 1 Mbyte is
on the main board and 1 Mbyte is standard memory board.
32 Kbytes (80386-20) or 64 Kbytes (80386-25) of cache memory
speeds up the T8500 processing.
The HOD has a capacity of 100 Mbytes. The FOO can support
200 (720 Kbytes) and 2HO (1.44 Mbytes) floppy disks. The
auto-sensing universal power supply is used worldwide, and
has one AC-OUT socket for supplying power to your display.
Figure 1-1 T8500 personal computer
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File No. 960-012
1.2 SYSTEM UNIT
The configuration of the system unit is shown in Figure 1-2.
SERIAL SCSI
Devices Device
bisplay EX-
FDD
PRT
r·_·_·_·
._._._._.- -~-.-.-.~.-.-.~.-.-.-.-.- _._._._._._._._._._._._._._._._._._.,
PJ13 PJ14
Connector
Board
I
PJ1S
PJ16
Main Board
PJ2 PJ10 PJ7 PJ8 PJ6
I
Lithium
Battery
I
Speaker
Board
: .................... -:
~ Internal ~
~
SCSI Device ~
~ .................... .:
PS
I
Cooling
Fan
PJS
1
FDD
PJ11
PJ3
PJ4
PJ1
PJ9
I
HDD
I
Option
HDD
....................
13100
Option
f--
Support
~
Board Card
....................
....................
PC-Bus
IBM PC AT
f--
Mother
~
Compatible
Board Board
....................
10-
Memory
Board
System Unit
L._._._._._._._._._._._._. __ ._._._._._._._._._._._._._._._._._._._._._._._._._._.-.-.-.-.~
IKeyboard
Figure 1-2 System unit configuration
1-2
)

File No. 960-012
The key features of the system unit are;
o 1 main board.
o 1 memory board.
o 1 speaker board.
o 1 T3100 support board.
o 1 PC-bus mother board having three IBM PC AT bus slots
and 1 IBM PC/XT bus slot.
o 1 internal 3.5-inch FDD supporting two media types;
- 2HD (double-side, high-density, double-track)
- 2DD (double-side, double-density, double-track)
The 2HD and 2DD floppy disks can be formatted with 1.44
Mbytes and 720 Kbytes of storage capacity,
respectively.
o 1 internal 3.5-inch 100-Mbyte HDD.
o 1 auto-~ensing universal power supply that can be used
worldwide provides +5 VDC, -5 VDC, +12 VDC and -12 VDC
to all the components on the system unit, including
optional IBM PC compatible boards and Toshiba size
optional card.
o 1 parallel printer, external FDD, SCSI, RGB, two serial
device connectors are located at the rear panel of the
system unit. 1 keyboard socket is located at the front
panel of the system unit.
1-3

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File No. 960-012
board is composed of the following components:
Central processing unit (CPU) 80386-20 or 80386-25:
The CPU is a 32-bit microprocessor operated at 20 MHz
or 25 MHz clock speed."
Numeric data processor (NPX) socket for the 80387-20 or
80387-25 and WE3167.
Real time clock (RTC) MC146818:
The RTC continuously keeps the data and time backed up
by a lithium battery.
Serial input output (510) TC8570:
The 510 controls the RS-232-C port.
Keyboard controller (KBC) (8742):
The KBC controls the serial data from the IBM PC AT
compatible keyboard.
Cache controller T9490F:
The cache controller T9490F improves memory access
operation dramatically with its 32 Kbytes high-speed
cache memory. This controller includes the cache
memory 32 Kbytes.
o Memories:
- System random access memory (RAM) 2 Mbytes; 1Mbyte is
on the memory board.
- System basic input/output read only memory (System
BIOS ROM) 64 Kbytes
- Video graphics subsystem (VGS) BIOS ROM 32 Kbytes
- Video RAM (VRAM) 256 Kbytes (64 Kbyte X 4)
o
Small computer system interface (SCSI) protocol
controller (SPC) MB89352:
The SPC supports the standard SCSI by the software.
o Super integration (51) T4758A and T9761:
The T4758A includes 2 direct memory access controller
(DMACs, equivalent to 82C37), 2 programmable interrupt
controller (PICs, equivalent to 82C59) and 1
programmable interval timer (PIT, equivalent to 82C54).
The T9761 includes the floppy disk controller (FDC,
equivalent to TC8565), programmable interval timer
(PIT, equivalent to 82C54) and serial input output
(510, equivalent to TC8570).
o Paradise video graphics array (PVGA1)
The PVGA1 has the following display control modes.
- Video graphics array (VGA) mode
- Enhanced graphics adapter (EGA) mode
- Color/graphics adapter (CGA) mode
- Monochrome display adapter (MDA) mode
o Gate arrays:
Gate arrays are used on the main board as follows.
- Bus controller gate array GA-BCNT (100-pin)
- Controller gate array GA-CCNT (100-pin)
- Address gate array GA-OWADR2 (100-pin)
- Cache controller gate array GA-CACCNT (62-pin)
1-5

File No. 960-012
1.4 MEMORY BOARD
The memory board has 1 Mbyte RAM and three expansion slots
(IS1, IS2, and IS3) for the single in-line memory module
(SIMM). This SIMM is provided three types, 2 Mbytes,
4 Mbytes, and 8 Mbytes.
The SIMM combination is shown in Table 1-1.
IS1
-
2 Mbytes
2 Mbytes
2 Mbytes
2 Mbytes
2 Mbytes
2
Mbytes
2 Mbytes
2
Mbvtes
Figure 1-4 Memory board
Table 1-1 SIMM combination
Slots
IS2
IS3
To~al
- -
--
2 Mbytes
-
2 Mbytes 2 Mbytes
4 Mbytes
-
4 Mbytes 4 Mbytes
8
Mbytes
-
8
Mbytes
2 Mbytes
8
Mbvtes
4 .. ~
m~mory caJ:Laci ty
2 Mbytes
4 Mbytes
6 Mbytes
8 Mbytes
8 Mbytes
12 Mbytes
12 Mbytes
14 Mbytes
16 Mbvtes
NOTE: The 4 Mbytes and 8 Mbytes of SIMM will be sold in
future.
1-6

File No. 960-012
1 .5 SPEAKER BOARD
The speaker board has one speaker, two LEOs and one key
switch connector.
One LED is lit green at power on: Its colors (green and
red) vary with clock speed (high and low) of cpu. The other
LED is lit red when the HOD is in operation.
Figure 1-5 Speaker board
1-7

File No. 960-012
1.6 PC-BOS MOTHER BOARD
PC-bus mother board relays the buses of extension boards for
IBM PC AT or PC/XT.
This board has three PC AT slots and one PC/XT slot.
Figure 1-6 PC-bus mother board
1-8

File No. 960-012
1.7 T3100 SUPPPRT BOARD
The T3100 support board relays the bus of an option card for
T3100.
This board has the connectors with 16 bits for T3100-
compatible data and 16 Mbytes for memory address space.
Figure 1-7 T3100 support board
1-9

File No. 960-012
1.8 3.S-IHCH FLOPPY DIS, DRrvE
The 3.5-inch internal FDD is a high-performance, reliable
and thin drive that suppo~ts 720-Kbyte (formatted) 2DD 3.5-
inch floppy disk, and 1.44-Mbyte (formatted) 2HD 3.5-inch
floppy disk.
The FDD is illustrated in Figure 1-8, and its specifications
are listed in Table 1-2.
Figure 1-8 3.5-inch FDD
1-10
\

File No. 960-012
Table 1-2 3.5-inch FDD specifications
Item
Storage capacity (Kbyte)
Unformatted
Formatted
No. of heads
No. of cylinders
Access time (ms)
1
track access
Average
Head setting time
~ecording density (bpi)
Track density (tracks/inch)
bata transfer rate
(Kbytes/sec)
Pisk rotational speed (rpm)
~ecording method
2-"~
1-11
mode
1-"~
mode
2000
1000
1440 720
(640)
2 2
80 80
3 3
94 94
15 15
17434 8717
135 135
500
250
300 300
Modified Frequency
Modulation (MFM)

File No. 960-012
1.9 3.S-INCH BARD DISK DRrYE
The 100 Mbyte (formatted) HDD is a random access storage
device which is provided with nonremovable 3.5-inch magnetic
disks and mini-Winchester type magnetic heads. The HDD is
illustrated in Figure 1-9, and its specifications are
tabulated in Table 1-3.
Figure 1-9 3.5-inch HDD
1-12

File No. 960-012
Table 1-3 3.5-inch HDD specifications
Item
Storage capacity (Mbytes)
Formatted
!Number of disks
lNumber of heads
lNumber of cylinders
!Number of tracks
lNumber of sectors per track
!Number of bytes per sector
Track capacity (bytes)
Formatted
~ecording density (bit per inch)
Track density, tracks per inch
~ecording method
pata transfer rate,
(Mbytes per second)
To/from media
To/from buffer
~otational speed (rpm)
iAccess time (ms)
Track to track
Average
Maximum
Pisk setup time (ms)
Start time (s)
Average
Maximum
Stop time (s)
Average
Maximum
1-13
Data
102.4
4
8
776
6,208
33
512
16,896
23,441
1,150
2-7 RLL (Run Length
Limited)
1.25
4.75, max.
3,575
8
25
45
8.33
15
20
15
20

File No. 960-012
1.10 POWER SUPPLY UNIT
This auto-sensing universal power supply unit, housed in the
system unit, can be used worldwide, and supplies the .
regulated power of +5, -5, +12 and -12 VDC to the following
devices:
( 1) Main board
(2) Memory board
(3) Speaker board
(4) PC-bus mother board
(5) T3100 support board
(6) 3.5-inch FDD
(7) 3.5-inch HDD
(8) Keyboard
(9) Optional HDD
(10) Option boards
(11) Cooling fan
This power supply unit is provided AC output 120 V or 240 V
for the external display.
The power supply unit is illustrated in Figure 1-10 and the
power supply output ratings are listed in Table 1-4.
Figure 1-10 Power supply unit
1-14

File No. 960-012
Table 1-4 Power supply unit output ratings
"'--
voltage current
Regulation
ain board +5
VDC 4
to
16.5 A
(keyboard and
-5
VDC
0
to
0.3 A
DD are +12
VDC 0.3
to
2.3 A
inclu e -12 VD
HDD +5
VDC
4
to
+12
VD
Coolin
fan
+12 VD
+ -
Display
+120
2.5 A +10%,
-30%
+24
1 4 A +10%
-22%
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File No. 960-012
1.11 DZP SWZTCBES
All DIP switches are initially set to off. Configuration
switch settings are summarized in the table below.
Switch
1
2
Off
On
3
Off
4
Off
On
5
Off
On
6,7
8
Off
n
Table 1-5 DIP switches
D i i n
Assigns IRQ4 to Toshiba-card slot
Assigns IRQ4 to all IBM-compatible-card
slots
Assigns IRQ3 to Toshiba-card slot
Assigns IRQ3 to all IBM-compatible-card
slots
Reserved (set to off)
Enables internal display controller
Disables internal display controller
Unidirectional printer port
Bidirectional printer port
Assigns serial ports
Assigns "EX-FDD" port to drive B
A . n "EX-FDD" A
Switch 1 assigns the system interrupt request channel IRQ4
to either IBM-compatible or Toshiba expansion cards.
Switch 2 assigns the system interrupt request channel IRQ3
to either IBM-compatible or Toshiba expansion cards.
Switch 3 is reserved for future use. This sw~tch must be
set to off.
Switch 4 enables and disables the main board's internal
display controller.
Switch 5 controls certain signal convention for printer
port. Usually the printer port is used for a parallel
printer, which requires the unidirectional setting. A
bidirectional setting allows both input and output. This
function is provided for future use.
1-16

File No. 960-012
Switch 6 and Switch 7 assign the port address of the two
internal serial ports (Serial 1 and 2). These switch
settings are defined as follows: '
SW6
Off
Off
On
On
SW7
Off
On
Off
On
Sarial 1
COM1
COM1
COM2
COM2
Sarial 2
COM2
COM3
COM1
COM3
Switch 8 sets the external FOO drive designation. An
external 5.25" disk drive connected to the "EX-FOO" port, is
assigned as drive A or drive B with this switch.
1-17

File No. 960-012
1.12 JUMPER STRAPS
1.12.1 PC-Bus Mother Board Strap
The PC-bus mother board has one jumper strap shown in Figure
1-11, and its status is listed in Table 1-6.
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Figure 1-11 PC-bus mother board strap
Table 1-6 PC-bus mother board strap status
PJ8: 2-pin header
(5D6, 5D7 pull up)
1-18

File No. 960-012
1.12.2 HOD Jumper Straps
The HDD has three jumper straps located on the hard disk
control board as shown in Figure 1-12, and their status is
listed in Table 1-7.
Figure 1-12 HDD jumper straps
Table 1-7 HDD jumper strap status
One-drive system
Si nal
C D
Two-drive system
First Second
1-19

File No. 960-012
1-20