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Epson Endeavor 486C Product Information Manual

Product information guide
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Computer Specifications

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
4DX2/50C: Intel i486DX2, 50 MHz
microprocessor in PGA-type CPU socket
System speed
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
power
button
option card slots
7/15/93
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
Memory
1MB, 4MB, or 16MB SIMMs to 36MB
(maximum); SIMMs must be 36-bit,
fast-page mode type with 70ns (or faster)
access speed
ROM
128KB system BIOS, video BIOS, and
SETUP code located in EPROM on main
system board
512KB DRAM on main system board,
Video RAM
expandable to 1MB using 256k x 4-bit
DRAM ZIP
Shadow RAM
Supports shadowing of system and video
BIOS ROM into RAM
8KB of internal cache (built into the
Cache
microprocessor); expandable to 256KB
using 8KB or 32KB, 70ns SRAM DIP chips
On 4DX/33C and 4DX2/50C systems,
Math
coprocessor
math coprocessor built into the
microprocessor; optional 487 upgrade
available for 4SX/25C system
Clock/calendar
Real-time clock, calendar, and CMOS
RAM socketed on main system board with
built-in battery backup
Controllers
Video
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
Diskette
up to two diskette drives or one diskette
drive and one tape drive
Hard disk
Interface on main system board supports
up to two IDE hard disk drives with
built-in controllers
Interfaces
VGA interface built into main system
Monitor
board for analog or multifrequency VGA
monitor; 15-pin, D-shell connector
EPSON Endeavor 486C
S
EPSON Endeavor 486C-1

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Summary of Contents for Epson Endeavor 486C

  • Page 1: Computer Specifications

    EPSON Endeavor 486C To select slow speed, press the Ctrl, Alt, power and - keys simultaneously. To select button 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;...
  • Page 2 EPSON Endeavor 486C Parallel One standard S-bit parallel, uni- or bi- Video Modes directional interface built into main system Mode Resolution board; I/O address selectable through 6 4 0 x 4 8 0 SETUP; 25-pin, D-shell connector 6 4 0 x 4 8 0...
  • Page 3 EPSON Endeavor 486C Main System Board Diagram EPSON Endeavor 486C-3 7/15/93...

  • Page 4: Major Subassemblies

    EPSON Endeavor 486C Serial Port Connectors (CN9 and CN10) Major Subassemblies Serial Port Connector Pin Assignments Keyboard Connector (CN5) and Mouse Connector (CN4) Although the keyboard and mouse connectors are physically identical, they cannot be used interchangeably. Connector Pin Assignments...

  • Page 5: Dma Assignments

    EPSON Endeavor 486C VGA Feature Connector (CN14) System l/O Address Map VGA Feature Connector Pin Assignments *Active low logic DMA Assignments Level Assigned device DMA0 Spare (8-bit) DMA1 Spare (8-bit) DMA2 Diskette drive controller (8-bit) DMA3 Spare (8-bit) DMA4 Cascade for DMA controller...

  • Page 6: System Memory Map

    External Cache Jumper Settings SIMM Configurations Factory setting; change jumpers only if external cache chips am Installed Standard memory on the system board ** SIMMs can occupy either socket EPSON Endeavor 486C-6 7/15/93...

  • Page 7: Video Memory

    EPSON Endeavor 486C Hard Disk Drive Types Video Memory If the computer has 512KB of video memory, you can install The table below lists types of hard disk drives supported by four 256K 4 bit, 70ns, 20-pin DRAM ZIP (Zig-zag Inline the computer.

  • Page 8: Information Reference List

    Try loading the program at slow speed TM-ENDVR4C and then switching to fast speed, if possible. Epson Endeavor 486C Parts Price List PL-ENDVR4C 0 When using a software package that uses a key disk as its Epson Endeavor 486C Self Paced Kit SPKENDVR4C copy-protection method, try loading it at fast speed.

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