Epson Endeavor 486C Installation and operation manual

EPSON Endeavor 486C
power
button
Memory
ROM
bay for hard disk, diskette drive,
CD-ROM, tape drive, or other
Video RAM
option card slots
Computer Specifications
Shadow RAM
Cache
Math
coprocessor
Clock/calendar
Controllers
Video
CPU and Memory
32-bit CPU
4SX/25C: Intel i486SX, 25 MHz
microprocessor in PGA-type CPU socket;
can be upgraded with optional 487SX/25
or ODP486-25 OverDrive™ processor
4DX/33C: Intel i486DX, 33 MHz
microprocessor in PGA-type CPU socket;
can be upgraded with optional ODP486-33
OverDrive processor
Diskette
Hard disk
System speed
4DX2/50C: Intel i486DX2, 50 MHz
microprocessor in PGA-type CPU socket
Fast and slow speeds available; fast speed
depends on CPU (25 MHz, 33 MHz, or
50 MHz), slow speed is simulated 8 MHz
speed; speed selection through keyboard
command; 0 wait state memory access at
fast speed
Interfaces
Monitor
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To select slow speed, press the Ctrl, Alt,
and - keys simultaneously. To select
fast speed, press the Ctrl, Alt, and + keys
simultaneously. (Use the - or + key on the
numeric keypad.) Default system speed is
also user-selectable through SETUP
4MB RAM standard; expandable using
1MB, 4MB, or 16MB SIMMs to 36MB
(maximum); SIMMs must be 36-bit,
fast-page mode type with 70ns (or faster)
access speed
128KB system BIOS, video BIOS, and
SETUP code located in EPROM on main
system board
512KB DRAM on main system board,
expandable to 1MB using 256k x 4-bit
DRAM ZIP S
Supports shadowing of system and video
BIOS ROM into RAM
8KB of internal cache (built into the
microprocessor); expandable to 256KB
using 8KB or 32KB, 70ns SRAM DIP chips
On 4DX/33C and 4DX2/50C systems,
math coprocessor built into the
microprocessor; optional 487 upgrade
available for 4SX/25C system
Real-time clock, calendar, and CMOS
RAM socketed on main system board with
built-in battery backup
Cirrus® Logic GD5422 VGA controller on
main system board; provides true color
resolutions up to 800 x 600 with 512KB
standard memory; with 1MB upgraded
memory, provides resolutions up to
1280x1024
Controller on main system board supports
up to two diskette drives or one diskette
drive and one tape drive
Interface on main system board supports
up to two IDE hard disk drives with
built-in controllers
VGA interface built into main system
board for analog or multifrequency VGA
monitor; 15-pin, D-shell connector

EPSON Endeavor 486C
Parallel
Serial
Keyboard
Mouse
Option slots
Speaker
VGA feature
connector
Mass Storage
One standard S-bit parallel, uni- or bi-
directional interface built into main system
board; I/O address selectable through
SETUP; 25-pin, D-shell connector
Two RS-232C, programmable,
asynchronous interfaces built into main
system board; 9-pin, D-shell connectors
PS/2 compatible keyboard interface built
into main system board; num lock setting
selectable through SETUP; 6-pin, mini DIN
connector
PS/2 compatible mouse interface built into
main system board; 6-pin, mini DIN
connector
Four 16-bit (or 8-bit) I/O expansion slots,
ISA compatible, 8 MHz bus speed; three
slots accommodate any size card,
bottom slot can hold reduced size card
(4.4 inch/110 mm)
Internal, piezo-electric speaker on main
board
IBM compatible VGA pass-through
interface built into main system board;
26-pin connector
Diskette drives
Hard disk drives
a&Inch form factor hard disk drive(s). up to
Other devices
half-height size; the first mounted vertically, second
mounted horizontally
Half-height tape drive, CD-ROM, or other storage
device; 5!Nnch or Sl&lnch with mounting frames
Three half-height drives maximum configurable using
the following:
5.2!S-inch, 1.2MB (high-density) capacity
3.5-inch, 1.44MB (high-density) capacity
5.25-inch, 360KB (double-density) capacity
3.5-inch, 720KB (double-density) capacity
Dual diskette drive: 3.5-inch, 1.44MB and 5.25-inch,
1.2MB
Keyboard
Detachable, two-position height; 101 or 102
sculpted keys; country-dependent main
typewriter keyboard; numeric/cursor
control keypad; four-key cursor control
keypad; 12 function keys
SETUP
Stored in ROM; accessible by pressing the
Program
Delete key at the SETUP prompt during boot
Video Modes
Mode
Resolution
VGA 640x480
Extended,
640x480
512KB memory required 640 x 480
640x480
800x600
800x600
Extended,
640x480
1 MB memory required
800x600
Power Supply
185 watt, fan-cooled
1
Input ranges
Maximum outputs
Frequency
19Oto2WVAC
1+5VDCatllAmps,
+12 VDC at 2.0 Amps,
-5 VDC at 0.3 Amps,
-12 VDC at 0.3 Amps
47 to 63 Hz
Option Slot Power Limits
Maximum current +5 volts +12 volts -5 Volts and -12 Volts
For each slot
7 Amps 1.5 Amps 0.3 Amps
For all four slots 11 Amps 2 Amps 0.3 Amps
Environmental Requirements
Condition Operating Non-operating
Storage range
range range
Temperature 41° to 90° F-4° to 140° F-4° to 140° F
(5° to 32° C) (-20° to 60° C) (-20° to 60° C)
Humidity 20% to 90% 10% to 90% 10% to 90%
(non-
condensing)
Altitude
-330 to 9,900 ft -330 to 39,600 ft -330 to 39,600 ft
(-100 to 3,00m) (-100 to 12,000m) (-100 to 12,000m)
Maximum 68°F 104°F 134°F
wet bulb (20° C) (40° C) (57° C)
Acoustical 37.5 dB(A) N/A N/A
Physical Characteristics
Width
Depth
Height
Weight
14.8 inches (370 mm)
16.5 inches (412 mm)
4.8 inches (120 mm)
16.7 b (7.5 kg), with one diskette drive and one hard
disk, but without keyboard
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EPSON Endeavor 486C
Main System Board Diagram
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EPSON Endeavor 486C
Major Subassemblies
Serial Port Connectors (CN9 and CN10)
Connector Pin Assignments
Parallel Port Connector (CN8)
Serial Port Connector Pin Assignments
Keyboard Connector (CN5) and
Mouse Connector (CN4)
Although the keyboard and mouse connectors are physically
identical, they cannot be used interchangeably.
Keyboard and Mouse Connector Pin Assignments
Pin
Signal
Pin
Signal
1
Data
4
+5VDC (fused)
2
Resewed
5
clock
3
Ground
6
Reserved
VGA Port Connector (CN13)
Parallel Port Connector Pin Assignments
* Active low logic
VGA Port Connector Pin Assignments
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EPSON Endeavor 486C
VGA Feature Connector (CN14)
System l/O Address Map
VGA Feature Connector Pin Assignments
*Active low logic
DMA Assignments
Level
Assigned device
DMA0 Spare (8-bit)
DMA1
Spare (8-bit)
DMA2 Diskette drive controller (8-bit)
DMA3 Spare (8-bit)
DMA4
DMA5
DMA6
Cascade for DMA controller
Spare (16-bit)
spare (16-bit)
1 DMA7
1 spare (16-bit)
Hardware Interrupts
IRQ no.
IRQ0
IRQ1
IRQ3
IRQ4
Function
Timer output
Keyboard
Serial port 2
Serial port 1
1 IRQ5 1 Available parallel port 2)
I
1 IRQ6 I FDD controller
IRQ7
IRQ8
1 Parallel port 1
I Real-time clock
IRQ9
IRQ10
IRQ11
IRQ12
IRQ13
IRQ14
IRQ15
Available
Available
Available
PS/2 compatible mouse, optional pointing devices
Math coprocessor
HDD controller
Available
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EPSON Endeavor 486C
System Memory Map
Hard Disk Drive Jumper Settings
l lf CS (cable selection) is jumpered, the drive is a master if pin-28 is grounded
and a slave if pin-28 Is not grounded.
DIP Switch Settings
Switch Setting
1** ON
OFF
2**
ON
Off
3** ON
Off
4ON’
Off
5
ON’
Off
33 MHz CPU speed
25 MHz CPU speed
25 MHz CPU speed
33 MHz CPU speed
CPU present in PGA socket
CPU absent from PGA socket
Enable password security feature
Disable password security feature
Select color monitor
Select monochrome monitor
23FFFFF 36MB
Extended memory
I 1MB
System BIOS
(Shadow RAM, 64KB)
00E0000 Reserved for system BIOS (64KB)
Reserved for ROM on l/O cards
00C7FFF VGA BIOS ROM
(Shadow, 32KB)
VGA Color Text
00B8000 VGA Mono Text
00B0000 VGA Graphics
00A0000 Base memory 640KB
0100000
OOFOOOO
* Factory setting
l * Factory set according to system type
Processor Chips
The 4SX/25C or 4DX/33C systems can be upgraded with an
Intel OverDrive processor on the main system board to
effectively double the internal clock speed of the computer’s
microprocessor. Alternatively, the 4SX/25C accepts the Intel
487SX/25 microprocessor with built-in math coprocessor.
OverDrive Processors
OverDrive processor
ODP486-25
ODP486-33
Jumper and DIP Switch Settings
Display Adapter and CPU Jumper Settings
SIMM Installation
The computer comes with 4MB of memory on the main
system board. To increase the amount of memory in the
computer up to 36MB, install 36-bit, fast-page mode SIMMs
that operate at an access speed of 70ns or faster, with a
capacity of 1MB, 4MB, or 16MB.
The following table shows the possible SIMM configurations;
do not install memory in any other configuration.
Jumper Setting
Function
J3
A*
Enable the built-in VGA adapter
B
Disable the built-in VGA adapter so you can use a
display adapter on an option card as your primary 1
J4
**
A
B
adapter
Select DX or DX2 CPU
Select SX CPU
* Factory setting
l * Factory set according to system CPU
External Cache Jumper Settings SIMM Configurations
*
Factory setting; change jumpers only if external cache chips am Installed
l Standard memory on the system board
** SIMMs can occupy either socket
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EPSON Endeavor 486C
Video Memory
Hard Disk Drive Types
If the computer has 512KB of video memory, you can install
four 256K x 4 bit, 70ns, 20-pin DRAM ZIP (Zig-zag Inline
Package) chips to increase the video memory to 1MB. The
following table lists compatible DRAM ZIP chips.
Supported Video ZIP Chips
The table below lists types of hard disk drives supported by
the computer. Check this table and the hard disk manual to
find the correct type number(s) for the hard disk drive(s)
installed in the computer. Enter the type number(s) when you
set the hard disk drive configuration in the SETUP program.
Hard Disk Drive Types
Cache Memory
Additional cache memory can be installed in eight sockets in
Bank 0 and Bank 1 on the main system board. The figure
below shows how the SRAM are distributed.
8KB or 32KB SRAM chips can be installed. Bank 0 must be
filled before Bank 1. The SRAM type used for RAM in
locations U15 and U16 must match the type installed in the
banks. The table below shows the possible configurations.
Cache Memory Configuration
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EPSON Endeavor 486C
Installation/Support Tips
Mouse and Keyboard
0 When connecting the mouse and keyboard to the
computer, be careful to plug them into the proper ports.
Although the ports are physically identical, they are not
interchangeable, and damage may occur to the main
system board if you plug the connectors into the wrong
ports.
Installing Diskette Drives
P
Make sure that the drive type has been correctly selected
in the SETUP program.
Installing Hard Disk Drives
It is recommended that a 16-bit, AT-type hard disk
controller be used if you are installing a drive that cannot
use the embedded IDE interface. If you install a non-IDE
hard disk drive and controller card, you need to use the
SETUP program to disable the built-in IDE hard disk drive
interface.
When installing a hard disk drive, see the hard disk drive
types table on page 7 and use the SETUP program to select
the correct type number for the drive. You can select a
type number that matches the parameters for the drive or
a type number with parameters having lesser values, as
long as they do not exceed the maximum capacity (in MB)
of the drive. If there is no match for the drive, you can
select a user-defined drive type (47) and enter the drive’s
exact parameters.
Software Problems
Cl When installing a copy-protected software package, first
try the installation at fast speed. If this does not work
properly, select slow speed by pressing the Ctrl and Alt
keys and the - key on the numeric keypad
simultaneously. Try loading the program at slow speed
and then switching to fast speed, if possible.
0
When using a software package that uses a key disk as its
copy-protection method, try loading it at fast speed. If this
does not work, load it at slow speed.
EPSON Endeavor 486C-8
Password
0
P
Make sure that you do not forget the password you set up.
If you do:
1. Disable it by setting DIP switch 4 on the main system
board to OFF.
2. Then turn the computer on and off again.
3. Set DIP switch 4 to ON to enable the password function.
4. Run SETUP to enter a new password, if desired.
Users can enter a hot key designation in SETUP to secure
the system from unauthorized users. Once a password
and hot key have been set, when the hot key is pressed,
the keyboard and mouse lock until the user enters the
password.
Booting Sequence
Cl
If you cannot boot the computer from the hard disk drive,
make sure the booting sequence in the SETUP program is
set to A, C. Then boot the computer from a system diskette
in drive A.
Information Reference List
Engineering Change Notices
None.
Technical Information Bulletins
None.
Product Support Bulletins
None.
Related Documentation
TM-ENDVR4C Epson Endeavor 486C Service Manual
PL-ENDVR4C Epson Endeavor 486C Parts Price List
SPKENDVR4C Epson Endeavor 486C Self Paced Kit
400230800 Epson Endeavor 486C User’s Guide
7/15/93