System Memory Map; Jumper And Dip Switch Settings; Simm Lnstallation - Epson Equity 4 Specification

EPSON Equity 4+

System Memory Map

23FFFFF
Extended memory
System BIOS
(Shadow RAM, 64KB)
Reserved for system BIOS (64KB)
OOEOOOO
Resewed for ROM on I/O cards
VGA BIOS ROM (Shadow, 32KB)
oocoooo
VGA Color Text
VGA Mono Text
VGA Graphics
oooooOO

Jumper and DIP Switch Settings

Display Adapter and CPU Jumper Settings
Jumper Setting
Function
A'
Enable the built-in VGA adapter
B Disable the built-in VGA adapter so you can use a
d&play adapter on an option card as your primary
adapter
J4 A
Select DX2 CPU
B select sx CPU
External Cache Jumper Settings
size
Cache
OKB'
32KB A
A
128KB B
Factory setting; change jumpers only if external cache chips are installed
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EPSON Equity 4+ 6
Base memory
A A A
B A B
B A A
Hard Disk Drive Jumper Settings
Conner CP39194H
Conner CP39174E
Quantum LPS249AT DS jumpered'
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and a stave if pin-28 is not grounded.
DIP Switch Settings
Switch
1
2 t*
ON
OFF
3 *t
ON
OFF
4 ON'
O f f
5 ON'
OFF
Processor Chips
The 4SX/25 system 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/25 accepts the Intel 487SX/25
microprocessor with built-m math coprocessor.

SIMM lnstallation

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
SIMM1
0
4MB
4MB
A
4MB
A
A
Standard memory on the system board
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10/1/93
DS jumpers@
Function
33 MHz CPU speed
25 MHz CPU soeed
25 MHz CPU speed
33 MHz CPU speed
CPU present in PGA socket
CPU absent from PGA socket
Enable password secutfty feature
Select color monitor
Select monochrome monitor
* Factory set according to system type
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4MB
4MB 12MB
0
Drive
no jumpers
no jumpers'
I