Epson 486C - Manual

EPSON Endeavor 486C
power
button
Memory
ROM
bay for hard disk, diskette drive,
CD-ROM, tape drive, or other
Video RAM
option card slots
Computer Specifications
Shadow RAM
Cache
Math
coprocessor
Clock/calendar
Controllers
Video
CPU and Memory
32-bit CPU 4SX/25C: Intel i486SX, 25 MHz
microprocessor in PGA-type CPU socket;
can be upgraded with optional 487SX/25
or ODP486-25 OverDrive™ processor
4DX/33C: Intel i486DX, 33 MHz
microprocessor in PGA-type CPU socket;
can be upgraded with optional ODP486-33
OverDrive processor
Diskette
Hard disk
System speed
4DX2/50C: Intel i486DX2, 50 MHz
microprocessor in PGA-type CPU socket
Fast and slow speeds available; fast speed
depends on CPU (25 MHz, 33 MHz, or
50 MHz), slow speed is simulated 8 MHz
speed; speed selection through keyboard
command; 0 wait state memory access at
fast speed
Interfaces
Monitor
7/15/93 EPSON Endeavor 486C-1
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
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 ZIP S
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 4DX/33C and 4DX2/50C systems,
math coprocessor built into the
microprocessor; optional 487 upgrade
available for 4SX/25C 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
1280x1024
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