Jumper Settings; Simm Lnstallation - Epson Equity 4 Product Information Manual

EPSON Equity 4SX/25, 4DX/33, and 4DX2/50

Jumper Settings

J5
J7
Adapter, CMOS, and PQFP Jumper Settings
Jumper Jumper
number setting
Function
On Supports CGA adapters
Off'
Supports monochrome, EGA, MCGA, and
VGA adapters
2-3 Disables the built-in VGA display adapter so
you can use a disphy adapter on an option
card in the computer as the primary adapter
On Returns CMOS RAM to the factory settings
Off' Retains SETUP program settings
l-2' Reserved
2-3 Keyboard reset
1-2
Enables the WFP SW25 processor
Factory setting
l
Factory setting depends on type of processor on system board
** Two pin jumpers
l
Processor Jumper Settings
Processor type
487SX (in OverDrive socket)
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486DX (in OverDrive socket)
You need to change the processor jumper settings if you
install a new processor chip. The settings for J10, J11, and J12
must correspond to the type of chip installed.
EPSON Equity-6
J15
J l l J12
2-3 2-3 Off
l-2 1-2
2-3
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If the computer's microprocessor is a FQFP type, it is surface-
mounted on the main system board. To add an OverDrive
processor, install it in the empty OverDrive socket and
disable the original microprocessor by setting jumper J23 to
position 2-3. Also make sure JlO, J11, and J12 are set correctly.
Processor Speed Jumper Settirzgs
Processor type J19
(25 MHz)
n
(33 MHz)
You need to change the processor speed jumper settings if
you replace a 25 MHz processor with a 33 MHz processor.
Processor Chips
If you have the 4SX/25 or 4DX/33 system, you can install an
Intel OverDrive processor on the main system board to
effectively double the internal clock speed of the computer's
microprocessor. Alternatively, for the 4SX/25, you can install
the 487SX/25 microprocessor with built-in math coprocessor.
System

SIMM lnstallation

The computer comes with 4MB of memory installed in a
SIMM socket. To increase the amount of memory in the
computer up to 32MB, you can 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. Make sure
that both SIMMs operate at the same speed.
SIMM Configurations
4MB
i AMR . . ..-
B
B
4MB
B
I
4MB
4Mi B
4/1/93
J22
Off On Off
Off Off Off
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AMR
. . ..-
20MB
32MB
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