Epson Equity 4SX/25 Handleiding productinformatie - Pagina 6
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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)
I
I
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
I
I
I
I
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
i
AMR
. . ..-
20MB
32MB
I