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Computer Specifications
CPU and Memory
32-bit CPU
25 MHz system: 804865X processor,
50 MHz system: 80486DX2/50 processor
System speed
25MHz regardless of CPU; for 80486DX2/50,
50 MHz speed is internal only; 8 MHz
speed is simulated by inserting wait states;
high/low speed selection through software
or keyboard command; 0 wait state
memory access at high speed
System memory
4MB RAM standard soldered onto memory
board; base memory of 256KB, 512KB or
640KB selectable through jumpers.
Memory expandable using 256KB or
1MB SIMMS, up to 16MB (maximum);
SIMMs must be fast-page mode, 80ns access
speed (or faster)
ROM
128KB (includes system BIOS and VGA
BIOS)
Shadow RAM
0 wait state access speed; automatically
copies both ROM BIOS and video ROM
into RAM
Math coprocessor
Standard for 50 MHz model; on 25 MHz
model, 80486SX microprocessor can be
replaced with optional 80487SX chip
Cache controller
82385 (25MHz) standard
Cache RAM
32KB high-speed (25ns) static RAM; two-
way set associative.
Clock/calendar
Real-time clock, calendar, and
50-byte CMOS RAM for configuration;
battery backup
Equity Series Computers
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
5/12/92
EQUITY 486DX2/50 PLUS
EQUITY 486SX/25 PLUS
Supports up to two drives in any of four
formats: 5%inch, highdensity, 1.2MB;
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 1MB DRAM (video
memory) built into main system board;
supports up to 800 x 600 or 1024 x 768
pixels in 16-colors or up to 640 x 480 pixels
in 256-colors; multi-frequency monitor
required for resolutions over 640 X 480
15-pin, D-shell connector
RS-232C, programmable, asynchronous;
9-pin, D-shell connector
Standard &bit parallel, mono-directional;
25-pin, D-shell connector
Mini DIN, 6-pin connector for PS/2
compatible mouse or other device
Mini DIN, 6-pin connector for PS/2
compatible keyboard
Six standard input/output expansion slots
(five 16-bit ISA compatible and one 8-bit
ISA compatible); 8 MHz bus speed
Internal; operation controllable by the Setup
program
200W, fan-cooled, automatic (worldwide)
input voltage sensing
98 to 132 VAC and 195 to 264 VAC
+5 VDC at 22 Amps, +12 VDC at
6.8 Amps
-12 VDC at .50 Amps, -5 VDC at
.50 Amps
Up to five drives maximum
Two half-height or one full-height drives
or one third-height and one full-height
drives
466DX2/50 & 486SX/25 PLUS-1