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
power
button
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
Memory
128KB system BIOS, video BIOS, and
SETUP code located in EPROM on main
system board
ROM
bay for hard disk, diskette drive,
CD-ROM, tape drive, or other
512KB DRAM on main system board,
expandable to 1MB using 256k x 4-bit
DRAM ZIPS
Video RAM
option card slots
Supports shadowing of system and video
BIOS ROM into RAM
Shadow RAM
Cache
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
Math
coprocessor
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
Clock/ calendar
Controllers
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
Video
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
Controller on main system board supports
up to two diskette drives or one diskette
drive and one tape drive
D i s k e t t e
4DX/ 33C: Intel i486DX, 33 MHz
microprocessor in PGA-type CPU socket;
can be upgraded with optional ODP486-33
OverDrive processor
Interface on main system board supports
up to two IDE hard disk drives with
built-in controllers
Hard disk
4DX2/ 50C: Intel i486DX2, 50 MHz
microprocessor in PGA-type CPU socket
Interfaces
VGA interface built into main system
board for analog or multifrequency VGA
monitor; 15-pin, D-shell connector
Monitor
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
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EPSON Endeavor 486C
Main System Board Diagram
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EPSON Endeavor 486C
Serial Port Connectors (CN9 and CN10)
Major Subassemblies
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.
Connector Pin Assignments
Keyboard and Mouse Connector Pin Assignments
Parallel Port Connector (CN8)
Signal
+5VDC (fused)
clock
Pin
4
5
Signal
Data
Resewed
Ground
Pin
1
2
Reserved
6
3
VGA Port Connector (CN13)
Parallel Port Connector Pin Assignments
VGA Port Connector Pin Assignments
* Active low logic
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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
Spare (8-bit)
Spare (8-bit)
Diskette drive controller (8-bit)
Spare (8-bit)
Cascade for DMA controller
Spare (16-bit)
spare (16-bit)
DMA0
DMA1
DMA2
DMA3
DMA4
DMA5
DMA6
DMA7
spare (16-bit)
Hardware Interrupts
IRQ no.
IRQ0
IRQ1
Function
Timer output
Keyboard
IRQ3
Serial port 2
IRQ4
Serial port 1
IRQ5
IRQ6
IRQ7
Available parallel port 2)
FDD controller
Parallel port 1
I
IRQ8
IRQ9
I Real-time clock
Available
IRQ10
IRQ11
IRQ12
IRQ13
IRQ14
IRQ15
Available
Available
PS/2 compatible mouse, optional pointing devices
Math coprocessor
HDD controller
Available
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EPSON Endeavor 486C
Hard Disk Drive
Settings
System Memory Map
23FFFFF
36MB
l
lf CS (cable selection) is jumpered, the drive is
and a slave if pin-28 Is not grounded.
a
master if pin-28 is grounded
DIP Switch Settings
Switch
1**
Setting
ON
OFF
ON
O f f
ON
O f f
ON’
O f f
ON’
O f f
Extended memory
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
2**
3**
4
0100000
I
1MB
5
System BIOS
(Shadow RAM, 64KB)
Select monochrome monitor
l
*
Factory set according to system type
* Factory setting
OOFOOOO
00E0000
00C7FFF
Reserved for system BIOS (64KB)
Reserved for ROM on l/O cards
VGA BIOS ROM (Shadow, 32KB)
VGA Color Text
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.
00B8000
00B0000
00A0000
VGA Mono Text
VGA Graphics
640KB
OverDrive Processors
Base memory
OverDrive processor
ODP486-25
ODP486-33
Jumper and DIP Switch Settings
SIMM Installation
Display Adapter and CPU Jumper Settings
Jumper
J3
Setting
A*
B
Function
Enable the built-in VGA adapter
Disable the built-in VGA adapter so you can use a
display adapter on an option card as your primary
adapter
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.
J4
A
Select DX or DX2 CPU
Select SX CPU
**
B
The following table shows the possible SIMM configurations;
do not install memory in any other configuration.
* 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
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.
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
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
Password
Make sure that you do not forget the password you set up.
Installation/Support Tips
If you do:
Mouse and Keyboard
1. Disable it by setting DIP switch 4 on the main system
board to OFF.
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
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.
ports.
Installing Diskette Drives
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.
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.
Booting Sequence
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.
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.
Information Reference List
Engineering Change Notices
None.
Technical Information Bulletins
None.
Software Problems
Product Support Bulletins
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
None.
Related Documentation
Epson Endeavor 486C Service Manual
Epson Endeavor 486C Parts Price List
Epson Endeavor 486C Self Paced Kit
Epson Endeavor 486C User’s Guide
simultaneously. Try loading the program at slow speed
and then switching to fast speed, if possible.
TM-ENDVR4C
PL-ENDVR4C
SPKENDVR4C
400230800
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.
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