Epson EL 486UC Specifications

EL 486UC+ Specifications
The following diagrams illustrate the outside of the
EL 486UC+ system.
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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