Table of Contents
Advertisement
486C
EPSON Endeavor
System Memory Map
23FFFFF
Extended memory
0100000
I
System BIOS
(Shadow RAM, 64KB)
OOFOOOO
Reserved for system BIOS (64KB)
00E0000
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
Jumper and DIP Switch Settings
Display Adapter and CPU Jumper Settings
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
adapter
J4
A
Select DX or DX2 CPU
**
B
Select SX CPU
* Factory setting
* Factory set according to system CPU
l
External Cache Jumper Settings
*
Factory setting; change jumpers only if external cache chips am Installed
EPSON Endeavor 486C-6
Hard Disk Drive
36MB
lf CS (cable selection) is jumpered, the drive is a master if pin-28 is grounded
l
and a slave if pin-28 Is not grounded.
DIP Switch Settings
Switch
1**
2**
3**
4
1MB
5
* Factory setting
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
640KB
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.
SIMM Configurations
Standard memory on the system board
l
** SIMMs can occupy either socket
7/15/93
Settings
Setting
ON
33 MHz CPU speed
OFF
25 MHz CPU speed
25 MHz CPU speed
ON
33 MHz CPU speed
O f f
ON
CPU present in PGA socket
O f f
CPU absent from PGA socket
ON'
Enable password security feature
O f f
Disable password security feature
ON'
Select color monitor
O f f
Select monochrome monitor
* Factory set according to system type
l
OverDrive processor
ODP486-25
ODP486-33
Advertisement
Table of Contents
