Epson 486DX2, 486SX User Manual
EQUITY® 486DX2/50 PLUS
EQUITY® 486SX/25 PLUS
Product Information Guide
Quick Reference
Computer Specifications
Connector Pin Assignments .486DX2/50 & 486SX/25 PLUS-2
DMA Assignments
Hardware interrupts..
I/O Port Addresses
Jumper Settings
SIMM lnstallation
Hard Disk Drive Types
lnstallation/Support Tips..
Information Reference List
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486DX2/50 & 486SX/25 PLUS-3
486DX2/50 & 486SX/25 PLUS-3
.486DX2/50 & 486SX/25 PLUS-3
486DX2/50 & 486SX/25 PLUS-5
EPSON”
Computer Specifications
CPU and Memory
32-bit CPU
System speed
System memory
ROM
Shadow RAM
Math coprocessor
Cache controller
Cache RAM
Clock/calendar
25 MHz system:
50 MHz system:
25MHzregardlessofCPU;for80486DX2/50,
50
MHz speed is internal only; 8 MHz
speed is simulated by inserting wait states;
high/low speed selection through software
or keyboard
memory access at high speed
4MB RAM standard soldered onto memory
board; base memory of
640KB selectable through jumpers.
Memory expandable using 256KB or
IMB SIMMS, up to 16MB (maximum);
SIMMs must be fast-page mode, 80ns access
speed (or faster)
128KB
BIOS)
0 wait state
copies both ROM BIOS and video ROM
intoRAM
Standard for 50 MHz model; on 25 MHz
model,
replaced with optional
82385
32KB high-speed
way set associative.
Real-time clock, calendar, and
50-byte
battery backup
comman
(includes system BIOS and VGA
acceSS
80486SX
(25MHz)
CMOS RAM for configuration;
804865X
80486DX2/50
microprocessor can be
standard
processor,
processor
d; 0 wait state
256KB, 512KB
speed; automatically
80487SX
chip
(251-u)
static RAM;
two-
or
EQUITY 486DX2/50 PLUS
EQUITY 486SX/25 PLUS
Controllers
Diskette
Hard disk
Interfaces
Monitor
Serial
Parallel
Mouse port
Keyboard
Option slots
Power Supply
Type
Input ranges
Maximum outputs
Mass Storage Bays
Internal drive bay
Externally-accessible One third-height and two half-height drives
drive bay
Supports up to two drives in any of four
formats: 5%inch, highdensity,
5%inch,
3%inch,
31h-inch,
supports optional Epson tape drive;
controller on main system board
Supports up to two half-height drives;
embedded IDE controller; interface on main
system board
VGA adapter with
memory) built into main system board;
supports up to 800 x 600 or 1024 x 768
pixels in
in
required for resolutions over 640 X 480
15-pin, D-shell connector
RS232C,
9-pin, D-shell connector
Standard &bit parallel, mono-directional;
25-pin, D-shell connector
Mini DIN,
compatible mouse or other device
Mini DIN,
compatible keyboard
Six standard input/output expansion slots
(five
ISA compatible); 8 MHz bus speed
Internal; operation controllable by the Setup
program
2OOW,
input voltage sensing
98 to 132 VAC and 195 to 264 VAC
+5
-12 VDC at
so
Up to five drives maximum
Two half-height or one full-height drives
or one third-height and one full-height
drives
double-density, 360KB;
highdensity, 144MB; or
double-density, 720KB; also
1MB
&colors
256-colors;
programmable, asynchronous;
16&t
fan-cooled, automatic (worldwide)
VDC at 22 Amps,
6.8 Amps
Amps
or up to 640 x
multi-frequency monitor
6-pin
connector for
6-pin
connector for
ISA compatible and one &bit
+12
.50
Amps, -5 VDC at
1.2MB;
DRAM (video
480
pixels
PS/2
F’S/2
VDC at
Equity Series Computers
5/12/92
486DX2/50 & 486SX/25 PLUS-l
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