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
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