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EPSON Equity 4+
System Memory Map
23FFFFF
36MB
Extended memory
0199909
1MB
System BIOS
(Shadow RAM, 64KB)
OOFOCKKI
OOEOOOO
99C7FFF
Reserved for system BIOS (64KB)
oocoooo
0088000
ooBoooo
oOA9CUl9
oooooOO
Resewed for ROM on I/O cards
VGA BIOS ROM (Shadow, 32KB)
VGA Color Text
VGA Mono Text
VGA Graphics
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
d&play adapter on an option card as your primary
adapter
J4
.*
A
Select DX2 CPU
B
select sx CPU
*
Factory setting
**
Factory set according to system CPU
External Cache Jumper Settings
Cache
size
OKB’
1
JS
1
J6
1
J7
1
J8
1
J9
lB
]B
jB jB
IA
32KB A A
A A
A
64KB A
B
A
B
A
128KB
B
B
A A
A
1256KB
lB
]B ]B
lB
IB
l
Factory setting; change jumpers only if external cache
chips
are installed
Hard Disk Drive Jumper Settings
Made1
Number
I
Single Drive
I
Master
Drive
1
Slave
Drive
Conner
CP39194H
I
C/D
jumpered
I
CD
and DSP
jumpered
I
no jumpers
Conner
CP39174E C/D
jumpered
C/D
jumpered
no jumpers
Quantum
LPS249AT
DS
jumpered’
DS
jumpers@ no jumpers’
l
If
CS (cable selection) is jumpered, the drive is a master if pin-28 is grounded
and a stave if pin-28 is not grounded.
DIP Switch Settings
Switch
1
l
*
Setting
ON
OFF
Function
33 MHz CPU speed
25 MHz CPU soeed
2
t*
ON
25 MHz CPU speed
OFF
33 MHz
CPU
speed
3
*t
ON
CPU present in PGA socket
OFF
CPU absent from PGA socket
4
ON’ Enable password secutfty feature
Off
Disabte password security feature
5
ON’ Select color monitor
OFF
Select monochrome monitor
*
Factory setting
l
* Factory set according to system type
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
1
SIMM2
I
Total
0
IO
i
4MB’
1MB
lo
I5MB”
4MB
IO
1
8MB”
I
1MB
4MB
9MB”
4MB 4MB
12MB
16MB
0
29MB”
1MB
I16MB
I21MB”
4MB
I16MB
1
24MB”
I
16MB
I
16MB
I36MB
I
l
Standard memory on the system board
**
SlMMs can occupy either socket
EPSON Equity 4+ 6
10/1/93