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
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IBM PC AT
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Figure 1-2 System unit configuration
1-2
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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.
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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)
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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
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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.
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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
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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
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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
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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
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