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Epson EL 486UC Specifications
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Epson EL 486UC Specifications

Epson EL 486UC Specifications

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Download this manual See also: User Manual, Product Information Manual
EL 486UC+ Specifications
The following diagrams illustrate the outside of the
EL 486UC+ system.
\
AC inlet
AC outlet
MOUSE
PARALLEL
Computer Specifications
CPU and Memory
32-bit CPU
Intel 486SX/25 microprocessor;
upgradable to 486SX/33, 486DX/33,
486DX2/50, or 486DX2/66
System speed
Fast and slow speeds available; fast speed
is 25 MHz or the speed of your upgraded
microprocessor, slow speed is 8 MHz;
speed selection through keyboard
commands or jumper setting
To select slow speed, press Ctrl Alt and-;
to select fasts peed, press Ctrl Alt and+
(use the - or + key on the numeric keypad)
Memory
4MB RAM standard on a SIMM;
expandable to 64MB using 1MB, 2MB,
4MB, 8MB, 16MB, and 32MB SIMMs
(64MB maximum requires the use of 32MB
SIMMs; SIMMs must be tin-plated,
72-pin, 32-bit or 36-bit fast-page mode
type with access speed of 70ns or faster
ROM
128KB system BIOS, video BIOS, and
SETUP code located in EPROM on main
systemboard
Video RAM
512KB DRAM on main system board;
expandable to 1MB using 70ns or 80ns,
256 x 4
Shadow RAM
Supports shadowing of system and video
BIOS ROM into RAM
Supports relocation of 256KB of memory
Memory
relocation
from A0000h to BFFFFh and D0000h to
EFFFFh to extended memory
Cache
8KB of internal cache (built into the
microprocessor); supports 64KB, 128KB, or
256KB
8x8, 20ns DIP chips or 28-pin, 32x8,
20ns DlP chips
Math
Math coprocessor built into the
coprocessor
microprocessor for DX and DX2 systems
Clock/calendar
Contained in the 82C491 system controller
along with 64 bytes of CMOS RAM;
backed up by a soldered NiCad
rechargeable battery
Controllers
Video
Trident 8900CL VGA controller on main
system board; provides resolutions up to
1024 x 768 in 16 colors (up to 1024 x 768 in
256
12/1/93
Epson EL 486UC+
20-pin,
bit,
DIP DRAM chips
of external cache using 28-pin,
colors with 1MB of video memory)
Epson EL 486UC+-1

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Summary of Contents for Epson EL 486UC

  • Page 1 Epson EL 486UC+ Computer Specifications EL 486UC+ Specifications CPU and Memory The following diagrams illustrate the outside of the EL 486UC+ system. 32-bit CPU Intel 486SX/25 microprocessor; upgradable to 486SX/33, 486DX/33, 486DX2/50, or 486DX2/66 System speed Fast and slow speeds available; fast speed is 25 MHz or the speed of your upgraded microprocessor, slow speed is 8 MHz;...
  • Page 2 (on a system with three or more option cards, the installation of a second hard disk drive may overload the power supply) Half-height tape drive, CD-ROM, optical Other devices drive, or other storage device; 5!@nch or 31&.r~h with mounting frames 12/1/93 Epson EL 486UC+-2...

  • Page 3: Major Subassemblies

    Epson EL 486UC+ Major Subassemblies Jumper Settings System J=,Jn,J=,aQ Miscellaneous jumper settings Epson EL 486UC+-3...

  • Page 4: Simm Installation

    The computer’s processor can be upgraded by replacing the existing microprocessor with a faster one. You can either purchase an upgrade kit from Epson or buy the individual Use only tin-plated, 32-bit or 36-bit, 72-pin, fast-page mode components separately, as listed in the following table.

  • Page 5: Hard Disk Drive Types

    * Select 1 or none for the precomp value. If neither of these options are available, select the maximum available precomp value. ** Actual hard disk drive installed is subject to availability. IDE hard disk drive jumper settings 12/1/93 Epson EL 486UC+-5...

  • Page 6: System Memory Map

    Standard diskette drive specifications System Memory Map 000FFFFFFh DMA Assignments 00100000h 000C0000h Hardware Interrupts 000A0000h 12/1/93 Epson EL 486UC+-6...

  • Page 7: Connector Pin Assignments

    Serial port connector pin assignments (CN4 and CN5) Keyboard and mouse connector pin assignments (CN7 and CN6) VGA port connector pin assignments (CN2) Power supply connector pin assignments (CN8) Diskette drive connector pin assignments (J16)* *All odd-numbered pins are grounds Epson EL 486UC+-7 12/1/93...
  • Page 8 Epson EL 486UC+ 12/1/93 Epson EL486UC+-8...

  • Page 9: Information Reference List

    0 Make sure that the DX or DX2 processor has an adequate heat sink and fan installed to prevent overheating. The EL486UC+ADD Epson EL 486UC+ Service Manual Epson CPU upgrade kit comes with a heat sink and a fan. Addendum Other manufacturer’s kits may not include these items.

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