Epson 33 User Manual

Epson EL 4S/33+  
Memory  
-
2MB or 4MB RAM standard on SIMMs;  
expandable to 16MB (maximum) using  
256KB, 1MB, and 4MB SIMMs; SIMMs  
must be 30-pin, 8-bit or 9-bit, fast-page  
mode type with access speed of 70ns or  
faster (preferably tin-plated)  
EL 4S/33+ Components  
The following diagrams illustrate the outside of the  
EL 4S/33+ system.  
ROM  
64KB system BIOS and SETUP code  
located in EPROM on main system board;  
32KB video BIOS located in EPROM on  
main system board  
Video RAM  
256KB DRAM on main system board;  
expandable to 512KB or 1024KB using  
70ns or 80ns 44256 DIP chips  
Shadow RAM  
32KB or 64KB, 0 or 1 wait state access  
speed; system ROM BIOS and video ROM  
can be copied into RAM  
Memory  
relocation  
Supports relocation of 256KB of memory  
from A0000h to BFFFFh and D0000h to  
EFFFFh to extended memory  
Internal cache  
1KB built into microprocessor  
Math  
coprocessor  
Optional Cx83S87-33 coprocessor  
available  
Clock/calendar  
Real-time clock, calendar, and CMOS  
RAM socketed on main system board with  
built-in battery backup  
Controllers  
Video  
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  
\
VGA  
Diskette  
Controller on main system board supports  
up to two diskette drives  
power inlet  
AC outlet  
MOUSE  
Hard disk  
Interface on main system board supports  
up to two IDE hard disk drives with  
built-in controllers; BIOS provides hard  
disk auto-sensing function  
Computer Specifications  
Interfaces  
Monitor  
CPU and Memory  
Cyrix® or Texas Instruments® 486SLC,  
33 MHz microprocessor with 16-bit data  
bus  
32-bit CPU  
VGA interface for analog monitor built  
into system board; 15-pin, D-shell  
connector  
Fast and slow speeds available; fast speed  
is 33 MHZ, slow speed is 8 MHz; speed  
selection through SETUP program and  
keyboard commands; zero wait state  
memory access at fast speed; 0 or 1 wait  
state memory access selectable through  
SETUP  
Parallel  
Serial  
System speed  
One standard 8-bit parallel, bidirectional  
interface built into main system board;  
25-pin, D-shell connector  
Two RS-232C, programmable,  
asynchronous interfaces built into main  
system board; 9-pin, D-shell connectors  
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Epson EL 4S/33+  
Major Subassemblies  
System Board Components  
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System board components and connectors  
Jumper Settings  
Use J10 with the built-in VGA adapter only. When J10 is ON, 1024 x 768  
mode is interlaced and 800  
x
600 mode  
refreshes at 56Hz. When J1O is  
OFF, 1024 x 768 is non-interlaced and refresh at 60Hz; 800 x 600  
refreshes at 72Hz. (VG 460 x 480 refreshes  
setting)  
at 60 Hz regardless of the J10  
“‘You can use MS-DOS to automatically reassign parallel and serial ports.  
Check your MS-DOS manual for more information.  
SIMM Installation  
Your computer comes with 2MB or 4MB of memory on  
SIMMs. You can increase the memory up to 16MB by  
installing 256KB, 1MB, or 4MB SIMMs in the computer’s four  
SIMM sockets. The following table shows the possible SIMM  
configurations; do not install memory in any other  
configuration.  
SIMM configuration  
Use only 30-pin, fast-page mode SIMMs (preferably  
tin-plated) that operate at an access speed of 70ns  
(nanoseconds) or faster. Be sure all the SIMMs operate at the  
same speed.  
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Epson EL 4S/33+ - 4  
Epson EL 4S/33+  
Hard disk drive types  
Video Memory  
The computer comes with 256KB of video memory. You can  
increase the video memory to 512KB or 1024KB by installing  
20-pin, 70ns or 80ns, 44256 DIP (Dual Inline Package) chips.  
For the memory to work properly, you must install one chip  
in each socket.  
Video memory chip configuration  
* Standard video memory  
Resolutions and colors  
Math Coprocessor Upgrade  
You can enhance your system’s performance for some  
applications by installing a Cx83S87-33 math coprocessor.  
Hard Disk Drive Types  
The computer comes with a hard disk auto-sensing feature.  
When you select AUTO DETECT 1 or 2 for your hard disk  
type in SETUP, the system detects the type of hard disk drive  
you have installed when you boot and fills in the drive  
information using values in the following table.  
Some older or preformated drives do not support the  
auto-sensing feature. If the parame ters displayed do not  
match the parameter of your hard disk drive, you can define  
your own drive type in SETUP.  
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Epson EL 4S/33+  
Standard diskette drive specifications  
Drive Option Information  
DMA Assignments  
Level  
DMA0  
DMA1  
Assigned device  
Reserved (8-bit)  
Reserved (8-bit)  
FDD controller (8-bit)  
Reserved (8-bit)  
DMA3  
Cascade for DMA controller 1  
Reserved (16-bit)  
Reserved (16-bit)  
Reserved (16-bit)  
DMA6  
DMA7  
Hardware Interrupts  
IRQ no.  
lRQ0  
IRQ1  
Function  
Timer output  
Keyboard  
IRQ2  
IRQ3  
IRQ4  
IRQ5  
IRQ6  
Cascade from IRQ controller 2  
Serial port 2  
Serial port 1  
Parallel port 2  
FDD controller  
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Epson EL 4S/33+  
System l/O Address Map  
System Memory Map  
000FFFFFFh  
System BIOS ROM: 64KB  
Dupliated from 0F0000h  
000FF0000h  
000FE0000h  
Reserved for system board: 64KB  
Duplicated from 0E0000h  
16MB (Maximum  
system memory)  
Extended memory  
1MB  
00100000h  
000F0000h  
System BlOS ROM: 64KB  
Default Shadow RAM duplicated at FF0000h  
Unused or l/O expansion ROM 160KB  
Reserved for ROM on I/O adapters  
000C8000h  
000C0000h  
VGA BlOS ROM: 32KB  
Default shadow RAM  
VGA text  
(color): 32KB  
Unused or VGA text  
(monochrome): 32KB  
Video memory: 64KB  
Reserved for graphics display buffer  
640KB  
000A0000h  
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Hard disk drive connector pin assignments (J38)  
Connector Pin Assignments  
Parallel port connector pin assignments (CN3)  
*Active low logic  
Serial port connector pin assignments (CN4 and CN5)  
*Active low logic  
Speaker connector pin assignments (J34)  
Optional game port connector pin assignments  
Optional game port interface pin assignments (J1)  
Option card riser board connector pin assignments (S1)  
VGA port connector pin assignments (CN2)  
Power supply connector pin assignments (CN8)  
Diskette drive connector pin assignments (J42)*  
*All odd=numbered pins are grounds  
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Option card riser hard connector pin assignments (S1) (continued)  
SIMM sockets (RAM1, RAM2, RAM3, RAM4)  
*Active low logic  
Use only 30-pin, 8-bit or 9-bit, fast-page mode SIMMs  
(preferably tin-plated) that operate at an access speed of 70ns  
(nanoseconds) or faster. SIMMs must operate at the same  
speed.  
Installation/Support Tips  
Installing Diskette Drives  
Make sure that the drive type has been correctly selected in  
the SETUP program.  
Installing Hard Disk Drives  
When installing a hard disk drive, see the hard disk drive  
type tables on pages 5 and 6 and use the auto-sensing  
feature in SETUP to select the correct type number for the  
drive. If the auto-sensing feature does not produce a  
match for the drive, you can define your own drive type  
by selecting User Def  
1
or 2 as the type and entering  
the drive’s exact parameters.  
*Active low logic  
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 J21 and J30 to position 2-3.  
If you plan to install two hard disk drives in the internal  
bays, you must use flat-head screws (#6-32UNC x 8  
FH,M,+) to secure the top drive to the mounting bracket.  
If you are installing an ESDI hard disk drive, make sure  
you disable the built-in IDE hard disk drive interface by  
moving jumpers J21 and J30 to position 2-3. Also be sure  
to remove the hard disk drive ribbon connector from the  
system board.  
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Epson EL 4S/33+  
Software Problems  
Information Reference List  
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  
Engineering Change Notices  
None.  
simultaneously. Try loading the program at low speed  
and then switching to high speed, if possible.  
Technical Information Bulletins  
None.  
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.  
Product Support Bulletins  
None.  
Installing Option Cards  
Related Documentation  
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.  
TM-EL3/4S33  
Epson EL 3S/33 and 4S/33 Service Manual  
EL4S33+ADD  
PL-EL4S33+  
400275000  
Epson EL 4S/33+ Service Manual Addendum  
Epson EL 4S/33+ Parts Price List  
Make sum the power requirements of the option cards  
you install do not exceed the power supply limitations.  
Epson EL 4S/33+ User’s Guide  
If the computer locks up, the power supply may be  
overloaded. On a system with three or more option cards,  
the installation of a second hard disk drive may overload  
the power supply.  
If you are installing a video adapter card, make sure you  
disable the built-in VGA by changing jumpers J7, J8, and  
J9 to the Off position.  
COM Port Assignment  
If you want to assign COM1 as COM3, you must set jumper  
J24 to position 2-3. If you want to assign COM2 as COM4,  
you must set jumper J26 to position 2-3.  
System Problems  
Do not attempt to install OS/2, version 2.1, from  
CD-ROM.  
Do not use this computer as a server in a multi-LAN  
environment.  
When using SCO UNIX, the CMOS settings may be lost  
when you boot the system. Also, keyboard input is not  
accepted unless the Cyrix cache is disabled or the slow  
refresh is set.  
You cannot use an external hard disk drive with this  
computer.  
When an extended memory test is run on QAFE, the  
system hangs. This is a problem with the way QAFE  
handles Cyrix memory.  
12/93  
Epson EL 4S/33+ - 10  

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