Page 1
Epson EL 4S/33
reset
button
harddisk ‘ght
access light
hard disk or diskette
drive bay
monitor cable
I
diskette drive
power
button
option
Card
slots
System speed
Memory
ROM
Video RAM
Shadow RAM
Math
coprocessor
Clock/calendar
High and low speeds available; high
speed is 33 MHz, low speed is 8 MHz;
speed selection through SETUP program
and keyboard commands; 0 or 1 wait state
memory access selectable through SETUP
To select low speed, press the
and - keys simultaneously. To select
high speed, press the
simultaneously. (Use the - or + key on the
numeric keypad.)
2MB or 4MB RAM standard on SIMMs;
expandable using 256KB, 1MB, or 4MB
SIMMs to 16MB (maximum); SIMMs must
be 30-pin, fast-page mode type with 70ns
(or faster) access speed
Phoenix BIOS A386 V1.03; 64KB system
BIOS, video BIOS, and SETUP code
located in EPROM on main system board
256KB DRAM on main system board,
expandable to 512KB or 1MB using 70ns
or 80ns 44256 DIP chips
32KB or 64KB, 0 or 1 wait state access
speed; system ROM BIOS and video ROM
can be copied into RAM
Socket for Cyrix Cx83S87-33 math
coprocessor
Real-time clock, calendar, and CMOS
RAM socketed on main system board with
built-in battery backup
Ctrl, Alt,
Ctrl, Alt,
and + keys
/
AC inlet AC outlet
\
Kd I I
I I
COM1 COM2 Parallel
Computer Specifications
CPU and Memory
32-bit CPU
Internal cache
Cyrix Cx486SLC, 33 MHz microprocessor
with 16-bit data bus
1KB built into microprocessor
I “AA
I
\
\
Game
Controllers
Video
Diskette
Hard disk
Interfaces
Monitor
Parallel
Trident VGA controller on main system
board; provides standard VGA
resolutions with 256KB memory and
extended VGA resolutions up to
1024 x 768 in 16 colors with 512KB
memory and 256 colors with 1MB memory
Controller on main system board supports
up to two diskette drives, maximum
Interface on main system board supports
up to two IDE hard disk drives,
maximum, with built-in controllers on the
hard disk drive itself
VGA interface built into main system
board for analog or multifrequency VGA
monitor; 15-pin, D-shell connector
One standard B-bit parallel, unidirectional
interface built into main system board;
25-pin, D-shell connector
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Epson EL 4S/33-1
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Epson EL 4S/33
Serial
Game
Keyboard
Option slots
Speaker
Mass Storage
Horizontal
mounts
Internal mount
Diskette drives
Hard disk
drives
Two RS-232C, programmable,
asynchronous interfaces built into main
system board; 9-pin, D-shell connectors
One game port interface built into main
system board; 15-pin, D-shell connector
PS/2 compatible keyboard interface built
into main system board; num lock setting
selectable through SETUP; 6-pin, mini
DIN connector
Three 16-bit (or 8-bit) full-length and two
8-bit half-length I/O expansion slots, ISA
compatible, 8 MHz bus speed
Internal
Up to four drives (two horizontal mounts
and two internal mounts), configurable
using the following:
Up to two externally-accessible, horizontal
mounts; one horizontal bay can
accommodate a half-height
S%inch
form
factor hard disk, diskette, tape, CD-ROM,
or other drive; the other horizontal bay
can accommodate one third-height
(one-inch) 3%-inch form factor hard disk,
diskette, tape, or other device
Two internal third-height (one-inch)
horizontal mounts; bays can
accommodate
3%~inch
form factor hard
disk or other drives
5.25-inch, 1.2MB (high-density)
3.5-inch, 1.44MB (highdensity)
5.25-inch, 360KB (double-density)
3.5-inch, 720KB (doubledensity)
31&nch
form factor hard disk drive(s),
third- or half-height size
Power Supply
Type
Input ranges 100 to 240 VAC
Maximum
outputs
Frequency 50/60 Hz
Cables
65 Watt, fan cooled
+5 VDC at 7.5 Amps, +12 VDC at
2.0 Amps, -12 VDC at 0.3 Amps
One to main system board; four to mass
storage devices
Option Slot Power Limits
Maximum current +5 volts
For all slots
This system does not support older option cards that may require -5 volts.
4.6
Amps
+12 volts
1.8 Amps
-12 volts
0.3 Amps
Environmental Requirements
Condition 1 Operating
Temperature
Humidity
(noncondensing)
Altitude
range
41° to 90° F
(5° to 32° C)
20% to 90%
-330to9,900ft-330
(-100 to 3,000m) (-100 to 12,000m) (-100 to 12400m)
1
Non-operating
range
-4° to 140° F
(-20° to 60° C)
10% to 90%
to
39,600ft-330to39,600
Storage range
-4° to 140° F
(-20° to 60° C)
10% to 90%
ft
Physical Characteristics
Width 15.6 inches (396 mm)
Depth
Height
Weight
14.5 inches (368 mm)
4.1 inches (104 mm)
15 lb (6.8 kg) without drives or keyboard
Other devices
Half-height tape drive, CD-ROM drive, or
other storage device;
or
mounting frames attached
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
Program
Stored in ROM; accessible by pressing
Ctrl, Alt, and S at the SETUP prompt
during boot
Epson EL 4S/33-2
3%~inch
S!&nch
form factor with
form factor
S%nch
9/93
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Epson EL 4S/33
Major Subassemblies
Connector Pin Assignments
Parallel Port Connector (CN3)
pin 13
pin 1
Serial Port Connectors (CN4 and CN5)
Serial Port Connector Pin Assignments
Keyboard Connector (CON1)
5
6
pin 5
pin3
pin 1
Signal
clock
Reserved
pin6
pin4-w-
pin 2
Keyboard Connector Pin Assignments
Pin Signal Pin
1
Data 4 +5 VDC
2
Reserved
3
Ground
VGA Port Connector (CN2)
pin 25 pin 14
Parallel Port Connector Pin Assignments
‘Active low logic
VGA Port Connector Pin Assignments
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Epson EL 4S/33-3
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Epson EL 4S/33
Game Port Connector (CN1)
pin 6
pin 15
Game Port Connector Pin Assignments
DMA Assignments
pin 1
pin 9
System Memory Map
000FFFFFFh
System BIOS ROM: 64KB
Duplicated from 0F0000h
000FF0000h
Reserved for system board: 64KB
Duplicated from 0E0000h
000FE0000h
Extended memory
00100000h
System BIOS ROM: 64KB
Default Shadow RAM duplicated at FF0000h
000F0000h
16MB
[Maximum
system
Memory)
1MB
Hardware Interrupts
1
IRQ14
IRQ15 1 Avaiiabie
HDD controller
000C8000h
000C0000h
000B8000h
000B0000h
000A0000h
Unused or I/O expansion ROM: 160KB
Resewed for ROM on I/O adapters
VGA BIOS ROM: 32KB
Default Shadow RAM
VGA text
(color): 32KB
Unused or VGA text
(monochrome): 32KB
video memory: 64KB
Resewed for graphics display buffer
640KB
Conventional system memory: 640KB
Epson EL 4S/33-4
9/93
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Epson EL 4S/33
System l/O Address Map
Jumper Settings
Port Jumper Settings
Jumper
number
J2
J10
J11
J15***
off*
J27
* Factory setting
**
DOS automatically reassigns parallel and serial ports. Check your DOS
manual for mom information.
“‘Two pin jumper
1-2*
2-3
Non-interlaced mode
Enables diskette drive controller
Disables diskette drive controller
Drive Assignment Jumper Settings
Drive assignment
Upper drive is A
Lower drive is A
* Factory setting
J17 J18
2-3 2-3
1-2* 1-2* 1-2* 1-2*
J19
2-3 2-3
J20
Hard Disk Drive Controller Jumper Settings
Hard disk controller
Enable 1-2’
Disable
* Factory setting
** Two-pin jumper
J25
2-3
J22**
On*
off
Built-in VGA Jumper Settings
Built-in VGA
Enable
I
Disable
* Factory setting
** Two-pin jumper
J36** J37**
On* On*
Off Off
To use an external display adapter in an expansion slot, you
must disable the built-in VGA adapter.
9/93
Epson EL 4S/33-5
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Epson EL 4S/33
Processor Chips
You can install a Cyrix Cx83S87-33 math coprocessor on the
main system board.
SIMM Installation
The computer comes with 2MB or 4MB of memory installed
on SIMMS. To increase the amount of memory in the
computer up to 16MB, you can install 30-pin, fast-page mode
SIMMs that operate at an access speed of 70ns or faster, with
a capacity of 256KB, 1MB, or 4MB.
The following table shows the possible SIMM configurations;
do not install memory in any other configuration. Make sure
that all SIMMs operate at the same speed.
SIMM Configurations
Hard Disk Drive Types
The table below lists types of hard disk drives you can use in
the computer. Check this table and your hard disk manual to
find the correct type number(s) for the hard disk drive(s)
installed in the computer. You need to enter the type
number(s) when you set the hard disk drive configuration in
the SETUP program.
Hard Disk Drive Types
Video Memory
Your computer has 256KB of video memory. You can install
four or six video DRAM,
(Dual Inline Package) chips to increase the video memory to
512KB or 1MB. The following table lists possible video
memory configurations.
Video Memo y Chip Configuration
Bank 0
Soldered
soldered
1
Soldered1 Filed
* Standard video memory
Video Memo y and Supported Resolutions
Bank 1
Filed
20-pin, 70ns
Bank 2
1
Filed
or 80ns, 44256 DIP
Bank 3
1
Filled
Total
memory
256KB*
512KB
1
1024KB
I
*
Actual formatted size may be slightly different than size on drive label.
Epson EL 4S/33-6
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Epson EL 4S/33
If the computer has an Epson-supplied hard disk drive,
select a user-defined drive type and enter the appropriate
information from the table below using the SETUP program.
Epson-supplied Hard Disk Drive Types
Epson drive options
*
Actual formatted size may be slightly different than size on drive label.
lcyi IHeadsIRecomplLZ
Installation/Support Tips
Installing Diskette Drives
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 disable
the built-in IDE hard disk drive interface by moving
jumpers J25 to position 2-3 and J22 to the Off position.
When installing a hard disk drive, see the hard disk drive
type tables 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 (48 or 49)
and enter the drive’s exact parameters.
If you are going to install NetWare 286, version 2.2, install
the IDE.OBJ and IDE.DSK drivers contained within the
IDE286.ZIP file available from Netwire on CompuServe.@
Alternatively, assign the pre-defined hard disk drive type
that most closely matches the drive you are installing
rather than assigning a user-defined drive type.
Software Problems
When installing a copy-protected software package, first
try the installation at high speed. If this does not work
properly, select low speed by pressing the Ctrl and Alt
keys and the - key on the numeric keypad
simultaneously. Try loading the program at low speed
and then switching to high speed, if possible.
When using a software package that uses a key disk as its
copy-protection method, try loading it at high speed. If
this does not work, load it at low speed.
Installing Option Cards
Although the EL 4S/33 will support most full-length option
cards, option cards with an I/F connector on the back may
not fit into the option slot.
Note that the EL 4S/33 system does not support older option
cards requiring -5 VDC.
COM Port Assignment
If you want to assign COM1 as COM3, you must set jumper
J10 to position 2-3. You also need to install a special driver
available from Epson technical support.
Using IBM 3270/PC 3270 Emulation
If you are using the IBM 3270/PC 3270 Emulation Entry
software, version 2.2, you may see only half the font when
you switch from a terminal emulation session to DOS. Install
the patch program available from the Epson Bulletin Board
at (310) 782-4531.
Game Port Problems
Some joysticks may not calibrate properly with certain game
software applications that accept joystick input. If the
joystick connected to the built-in game port does not work
with the game software you are using, try repositioning the
trim knobs on the joystick. If that doesn’t work, you may
want to purchase a joystick option card. If you do, make sure
you set jumper J4 to position 2-3 to disable the built-in game
port.
If you are installing an ESDI hard disk drive, make sure
you disable the built-in IDE hard disk drive interface by
moving jumpers J25 to position 2-3 and J22 to the Off
position. Also be sure to remove the hard disk drive
ribbon connector from the system board.
If you install two hard disk drives in the internal drive
bays, you must use flat-head screws (#6-32UNC x8
FH,M,+) to secure the top drive to the mounting bracket.
You must also replace the existing 65 Watt power supply
with an 85 Watt power supply.
9/93
Epson EL 4S/33-7
Page 8
Epson EL 4S/33
Information Reference List
Engineering Change Notices
None.
Technical Information Bulletins
None.
Product Support Bulletins
None.
Related Documentation
400251400
TM-EL3/4S33
PL-EL4S33
EPSON EL 4S/33 User’s Guide
EPSON EL 3S/33 and EL 4S/33 Service
Manual
EPSONEL 4S/33 Parts Price List
Epson EL 4S/33-8
9/93
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