Epson 486dx2,486sx User Manual

32-bit CPU

System speed

System memory

ROM

Shadow RAM

Math coprocessor

Cache controller
Cache RAM

Clock/calendar

25 MHz system: 

 processor,

50 MHz system: 

 processor

 MHz speed is internal only; 8 MHz

speed is simulated by inserting wait states;

high/low speed selection through software

or keyboard 

d; 0 wait state

memory access at high speed
4MB RAM standard soldered onto memory

board; base memory of 

 

 or

640KB selectable through jumpers.

Memory expandable using 256KB or

 SIMMS, up to 16MB (maximum);

 must be fast-page mode, 80ns access

speed (or faster)

 (includes system 

 and VGA

BIOS)
0 wait state 

 speed; automatically

copies both ROM BIOS and video ROM

Standard for 50 MHz model; on 25 MHz

model, 

 microprocessor can be

replaced with optional 

 chip

82385 

 standard

 high-speed 

 static RAM; 

way set associative.

Real-time clock, calendar, and

 CMOS RAM for configuration;

battery backup

Diskette

Hard disk

Monitor

Serial

Parallel

Mouse port

Keyboard

Option slots

Input ranges
Maximum outputs

Supports up to two drives in any of four

formats: 

 highdensity, 

 double-density, 360KB;

 highdensity, 

 or

 double-density, 720KB; also

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 

 DRAM (video

memory) built into main system board;

supports up to 

 x 600 or 1024 x 768

pixels in 

 or up to 640 x 

 pixels

in 

 multi-frequency monitor

required for resolutions over 640   

15-pin, D-shell connector

 programmable, asynchronous;

9-pin, D-shell connector
Standard &bit parallel, mono-directional;

25-pin, D-shell connector
Mini DIN, 

 connector for 

compatible mouse or other device
Mini DIN, 

 connector for 

compatible keyboard
Six standard input/output expansion slots

(five 

 ISA compatible and one 

ISA compatible); 8 MHz bus speed
Internal; operation controllable by the Setup

 fan-cooled, automatic (worldwide)

input voltage sensing
98 to 132 VAC and 195 to 

 VAC

 VDC at 22 Amps, 

 VDC at

6.8 Amps

-12 VDC at   Amps, -5 VDC at

 Amps

Equity Series Computers

5/12/92

Up to five drives maximum

Internal drive bay

Two half-height or one full-height drives

Externally-accessible One third-height and two half-height drives

drive bay

or one third-height and one full-height

drives

486DX2/50 & 486SX/25 PLUS-l