EPSON Endeavor 486C
power
button
bay for hard disk, diskette drive, CD-ROM, tape drive, or other
option card slots
Computer Specifications
CPU and Memory
32-bit CPU
System speed
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
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
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To select slow speed, press the Ctrl, Alt, |
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and - keys simultaneously. To select |
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fast speed, press the Ctrl, Alt, and + keys |
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simultaneously. (Use the - or + key on the |
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numeric keypad.) Default system speed is |
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also user-selectable through SETUP |
Memory |
4MB RAM standard; expandable using |
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1MB, 4MB, or 16MB SIMMs to 36MB |
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(maximum); SIMMs must be 36-bit, |
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fast-page mode type with 70ns (or faster) |
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access speed |
ROM |
128KB system BIOS, video BIOS, and |
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SETUP code located in EPROM on main |
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system board |
Video RAM |
512KB DRAM on main system board, |
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expandable to 1MB using 256k x 4-bit |
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DRAM ZIPS |
Shadow RAM |
Supports shadowing of system and video |
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BIOS ROM into RAM |
Cache |
8KB of internal cache (built into the |
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microprocessor); expandable to 256KB |
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using 8KB or 32KB, 70ns SRAM DIP chips |
Math |
On 4DX/33C and 4DX2/50C systems, |
coprocessor |
math coprocessor built into the |
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microprocessor; optional 487 upgrade |
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available for 4SX/25C system |
Clock/calendar |
Real-time clock, calendar, and CMOS |
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RAM socketed on main system board with |
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built-in battery backup |
Controllers
Video |
Cirrus® Logic GD5422 VGA controller on |
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main system board; provides true color |
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resolutions up to 800 x 600 with 512KB |
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standard memory; with 1MB upgraded |
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memory, provides resolutions up to |
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1280x1024 |
Diskette |
Controller on main system board supports |
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up to two diskette drives or one diskette |
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drive and one tape drive |
Hard disk |
Interface on main system board supports |
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up to two IDE hard disk drives with |
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built-in controllers |
Interfaces
Monitor |
VGA interface built into main system |
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board for analog or multifrequency VGA |
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monitor; 15-pin, D-shell connector |
7/15/93 |
EPSON Endeavor 486C-1 |
EPSON Endeavor 486C
Main System Board Diagram
7/15/93 |
EPSON Endeavor 486C-3 |
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