Epson Equity 4+ - Manual (Page 6)

EPSON Equity 4+
System Memory Map
23FFFFF
Extended memory
System BIOS
(Shadow RAM, 64KB)
OOEOOOO
Reserved for system BIOS (64KB)
oocoooo
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
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’
J7
32KB A A A A A
A B A B A
128KB B B A A A
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Factory setting; change jumpers only if external cache are installed
Hard Disk Drive Jumper Settings
Number Single Drive Drive Slave Drive
Conner C/D and DSP no jumpers
Conner no jumpers
Quantum DS DS no jumpers’
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CS (cable selection) is the drive is a master if pin-28 is grounded
and a stave if pin-28 is not grounded.
DIP Switch Settings
Switch
1
Function
33 MHz CPU speed
25 MHz CPU
2 ON 25 MHz CPU speed
OFF 33 MHz speed
3 ON CPU present in PGA socket
OFF CPU absent from PGA socket
4 ON’ Enable password feature
O f f password security feature
5 ON’ Select color monitor
OFF Select monochrome monitor
Factory setting
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* 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 SIMM2 Total
0 4MB’
4MB
4MB
4MB 4MB 12MB
0
4MB
I
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Standard memory on the system board
can occupy either socket
EPSON Equity 4+ 6 10/1/93