power
button
EPSON Endeavor 486C
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
bay for hard disk, diskette drive,
CD-ROM, tape drive, or other
option card slots
Memory
ROM
Video RAM
Shadow RAM
Cache
Math
coprocessor
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
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
S
Computer Specifications
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
4DX2/50C: Intel i486DX2, 50 MHz
microprocessor in PGA-type CPU socket
Clock/calendar
Controllers
Video
Diskette
Hard disk
Interfaces
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
System speed
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
7/15/93
Monitor
VGA interface built into main system
board for analog or multifrequency VGA
monitor; 15-pin, D-shell connector
EPSON Endeavor 486C-1
EPSON Endeavor 486C
Parallel
Serial
Keyboard
Mouse
Option slots
Speaker
One standard S-bit parallel, uni- or bidirectional 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
Video Modes
Mode
VGA
Extended,
512KB memory required 640 x 480
Extended,
1 MB memory required
Resolution
640x480
640x480
640x480
800x600
800x600
640x480
800x600
Power Supply
185
Input ranges
Maximum outputs
Frequency
Option Slot Power Limits
19Oto2WVAC
1+5VDCatllAmps,
+12 VDC
-5 VDC at 0.3 Amps,
-12 VDC at 0.3 Amps
47 to 63 Hz
watt, fan-cooled
at 2.0 Amps,
1
VGA feature
connector
Mass Storage
Diskette drives
Hard disk drives
Other devices
Keyboard
IBM compatible VGA pass-through
interface built into main system board;
26-pin connector
Three half-height drives maximum configurable using
the following:
5.2!S-inch,
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
a&Inch
half-height size; the first mounted vertically, second
mounted horizontally
Half-height tape drive, CD-ROM, or other storage
device;
1.2MB (high-density) capacity
form factor hard disk drive(s). up to
5!Nnch
or Sl&lnch with mounting frames
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
Maximum current +5 volts +12 volts -5 Volts and -12 Volts
For each slot
For all four slots
7 Amps
11
Amps 2 Amps
1.5 Amps
0.3 Amps
0.3
Amps
Environmental Requirements
Condition
Temperature
Humidity 20% to 90%
(non-
condensing)
Altitude
Maximum 68°F
wet bulb (20° C)
Acoustical 37.5 dB(A)
Operating Non-operating
range
41° to 90°
(5° to 32° C)
-330 to 9,900 ft
(-100 to 3,00m)
F
range
-4° to 140° F -4° to 140° F
(-20° to 60° C) (-20° to 60° C)
10% to 90% 10% to 90%
-330 to 39,600 ft -330 to 39,600 ft
(-100 to 12,000m) (-100 to 12,000m)
104°F
(40° C) (57° C)
N/A N/A
Storage range
134°F
Physical Characteristics
Width
Depth
Height
Weight
14.8 inches (370 mm)
16.5 inches (412
4.8
inches (120 mm)
16.7
b (7.5
disk, but without keyboard
mm)
kg), with one diskette drive and one hard
SETUP
Program
Stored in ROM; accessible by pressing the
Delete key at the SETUP prompt during boot
EPSON Endeavor 486C-2
7/15/93
Main System Board Diagram
EPSON Endeavor 486C
7/15/93
EPSON Endeavor 486C-3
EPSON Endeavor 486C
Major Subassemblies
Serial Port Connectors (CN9 and CN10)
Serial Port Connector Pin Assignments
Keyboard Connector (CN5) and
Mouse Connector (CN4)
Connector Pin Assignments
Parallel Port Connector (CN8)
Parallel Port Connector Pin Assignments
Although the keyboard and mouse connectors are physically
identical, they cannot be used interchangeably.
Keyboard and Mouse Connector Pin Assignments
Pin
1
2
3
Signal
Data
Resewed
Ground
Pin
4
5
6
Signal
+5VDC (fused)
clock
Reserved
VGA Port Connector (CN13)
VGA Port Connector Pin Assignments
* Active low logic
EPSON Endeavor 486C-4
7/15//93
EPSON Endeavor 486C
VGA Feature Connector (CN14)
VGA Feature Connector Pin Assignments
*Active low logic
System l/O Address Map
DMA Assignments
Level
DMA0
DMA1
DMA2
DMA3
DMA4
DMA5
DMA6
1
DMA7
Assigned device
Spare (8-bit)
Spare (8-bit)
Diskette drive controller (8-bit)
Spare (8-bit)
Cascade for DMA controller
Spare (16-bit)
spare (16-bit)
1
spare (16-bit)
Hardware Interrupts
IRQ no.
IRQ0
IRQ1
IRQ3
IRQ4
1
IRQ5
1
IRQ6
IRQ7
IRQ8
IRQ9
IRQ10
IRQ11
IRQ12
IRQ13
IRQ14
IRQ15
Function
Timer output
Keyboard
Serial port 2
Serial port 1
1
Available parallel port 2)
I
FDD controller
1
Parallel port 1
I Real-time clock
Available
Available
Available
PS/2 compatible mouse, optional pointing devices
Math coprocessor
HDD controller
Available
I
7/15/93
EPSON Endeavor 486C-5
EPSON Endeavor
486C
System Memory Map
23FFFFF
Extended memory
0100000
I
System BIOS
(Shadow RAM, 64KB)
36MB
1MB
Hard Disk Drive
l
lf CS (cable selection) is jumpered, the drive is
and a slave if pin-28 Is not grounded.
Jumper
Settings
DIP Switch Settings
Switch Setting
1**
2**
3**
4 ON’
5
* Factory setting
ON
OFF
ON
Off
ON
Off
Off
ON’
Off
33 MHz CPU speed
25 MHz CPU speed
25 MHz CPU speed
33 MHz CPU speed
CPU present in
CPU absent from PGA socket
Enable password security feature
Disable password security feature
Select color monitor
Select monochrome monitor
l
*
Factory set according to system type
PGA socket
a
master if pin-28 is grounded
OOFOOOO
00E0000
00C7FFF
00B8000
00B0000
00A0000
Reserved for system BIOS (64KB)
Reserved for ROM on l/O cards
VGA BIOS ROM
VGA Color Text
VGA Mono Text
VGA Graphics
Base memory
(Shadow, 32KB)
Jumper and DIP Switch Settings
Display Adapter and CPU Jumper Settings
Jumper
J3
J4
* Factory setting
Setting
A*
B
A
**
B
Function
Enable the built-in VGA adapter
Disable the built-in VGA adapter so you can use a
display
adapter
Select DX or DX2 CPU
Select SX CPU
l
*
Factory set according to system CPU
adapter on an option card as your primary
640KB
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
SIMM Installation
The computer comes with 4MB of memory on the main
system board. To increase the amount of memory in the
1
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.
External Cache Jumper Settings
Factory setting; change jumpers only if external cache chips am Installed
*
EPSON Endeavor 486C-6
SIMM Configurations
l
**
7/15/93
Standard memory on the system board
SIMMs can occupy either socket
EPSON Endeavor 486C
Video Memory
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
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.
Hard Disk Drive Types
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
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
7/15/93
EPSON Endeavor 486C-7
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
Make sure that the drive type has been correctly selected
P
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.
Password
0
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
P
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
If you cannot boot the computer from the hard disk drive,
Cl
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.
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
keys and the - key on the numeric keypad
simultaneously. Try loading the program at slow speed
and then switching to fast speed, if possible.
When using a software package that uses a key disk as its
0
copy-protection method, try loading it at fast speed. If this
does not work, load it at slow speed.
Alt
Information Reference List
Engineering Change Notices
None.
Technical Information Bulletins
None.
Product Support Bulletins
None.
Related Documentation
TM-ENDVR4C
PL-ENDVR4C
SPKENDVR4C
400230800
Epson Endeavor 486C Service Manual
Epson Endeavor 486C Parts Price List
Epson Endeavor 486C Self Paced Kit
Epson Endeavor 486C User’s Guide
EPSON Endeavor 486C-8
7/15/93
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