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EPSON Endeavor
486C
System Memory Map
Hard Disk Drive
Jumper
Settings
l
lf CS (cable selection) is jumpered, the drive is
a
master if pin-28 is grounded
and a slave if pin-28 Is not grounded.
DIP Switch Settings
Switch Setting
1**
ON
OFF
2**
ON
Off
3**
ON
Off
4 ON’
Off
5
ON’
Off
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
Select monochrome monitor
23FFFFF
36MB
Extended memory
I
1MB
System BIOS
(Shadow RAM, 64KB)
00E0000
Reserved for system BIOS (64KB)
Reserved for ROM on l/O cards
00C7FFF
VGA BIOS ROM
(Shadow, 32KB)
VGA Color Text
00B8000
VGA Mono Text
00B0000
VGA Graphics
00A0000
Base memory
640KB
0100000
OOFOOOO
* Factory setting
l
*
Factory set according to system type
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.
OverDrive Processors
OverDrive processor
ODP486-25
ODP486-33
Jumper and DIP Switch Settings
Display Adapter and CPU Jumper Settings
SIMM Installation
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.
The following table shows the possible SIMM configurations;
do not install memory in any other configuration.
Jumper
Setting
Function
J3
A*
Enable the built-in VGA adapter
B
Disable the built-in VGA adapter so you can use a
display
adapter on an option card as your primary
1
J4
**
A
B
adapter
Select DX or DX2 CPU
Select SX CPU
* 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