321 Studios EPSON Endeavor 486C User Manual

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  
Diskette  
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  
7/15/93  
EPSON Endeavor 486C-1  
EPSON Endeavor 486C  
Main System Board Diagram  
EPSON Endeavor 486C-3  
7/15/93  
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  
EPSON Endeavor 486C-4  
7/15//93  
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  
7/15/93  
EPSON Endeavor 486C-5  
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  
EPSON Endeavor 486C-6  
7/15/93  
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  
7/15/93  
EPSON Endeavor 486C-7  
EPSON Endeavor 486C  
Password  
Installation/Support Tips  
Make sure that you do not forget the password you set up.  
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.  
EPSON Endeavor 486C-8  
7/15/93  

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