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EPSON Equity 4+
power
(SPEED)
hard disk
diskette
power
light
access light
drive
button
Memory
bay for hard disk, diskette drive,
CD-ROM, tape drive, or other
option card slots
ROM
Video RAM
Shadow RAM
Cache
Math
coprocessor
Clock/calendar
Controllers
Video
power keyboard
I
’ ’
serial serial
\
VGA
inlet port
mo”s
POti’
pod2
monitor
poti
;F”
poti
Diskette
Computer Specifications
CPU and Memory
Hard disk
32-bit CPU
4SX/25: Intel
®
i-X,
25 MHz
microprocessor in PGA-type CPU socket;
can be upgraded with optional 487SX/25
or ODP486-25 OverDrive™ processor
4DX2/50: Intel
&36DX2,50
MHz
microprocessor in PGA-type CPU socket
Interfaces
Monitor
System speed
Fast and slow speeds available; fast speed
depends on CPU (25 MHz or 50 MHz),
slow is simulated 8 MHz speed; speed
selection through keyboard command; 0
wait state memory access at fast speed
Parallel
To select slow speed, press the Ctrl, Alt,
and - keys simultaneously. To select
fast speed, press the
Ctrl,
Alt, and + keys
simultaneously. (Use the - or + key on the
numeric keypad.) Default system speed is
also user-selectable through SETUP
Serial
4MB RAM standard; expandable using
1MB, 4MB, or 16MB SIMMs to 36MB
(maximum); SIMMs must be 36-bit,
fast-page mode type with 70ns (or faster)
access speed
128KB system BIOS, video BIOS, and
SETUP code located in EPROM on main
system board
512KB DRAM on main system board,
expandable to 1MB using 256k x 4-bit
DRAM ZIPs
Supports shadowing of system and video
BIOS ROM into RAM
8KB of internal cache (built into the
microprocessor); expandable to 256KB
using 8KB or 32KB, 70ns SRAM DIP chips
On 4DX2/50 system, math coprocessor
built into the microprocessor; optional 487
upgrade available for 4SX/25 system
Real-time clock, calendar, and CMOS
RAM socketed on main system board with
built-in battery backup
Cirrus
®
Logic GD5422 VGA controller on
main system board; provides true color
resolutions up to 800 x 600 with 512KB
standard memory; with 1MB upgraded
memory, provides resolutions up to
1280 x 1024
Controller on main system board supports
up to two diskette drives or one diskette
drive and one tape drive
Interface on main system board supports
up to two IDE hard disk drives with
built-in controllers
VGA interface built into main system
board for analog or multifrequency VGA
monitor; 15-pin, D-shell connector
One standard 8-bit parallel, uni- or bi-
directional interface built into main system
board; I/O address selectable through
SETUP; 25-pin, D-shell connector
Two RS-232C, programmable,
asynchronous interfaces built into main
system board; 9-pin, D-shell connectors
10/1/93
EPSON Equity 4+ 1