Epson 486 UC+ - Manual

Epson EL 486UC+
EL 486UC+ Specifications
The following diagrams illustrate the outside of the
EL 486UC+ system.
32-bit CPU
System speed
Memory
Computer Specifications
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AC inlet AC outlet MOUSE PARALLEL
CPU and Memory
ROM
Video RAM
Shadow RAM
Memory
relocation
Cache
Math
coprocessor
Clock/calendar
Controllers
Video
Intel 486SX/25 microprocessor;
upgradable to 486SX/33, 486DX/33,
486DX2/50, or 486DX2/66
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)
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
128KB system BIOS, video BIOS, and
SETUP code located in EPROM on main
systemboard
512KB DRAM on main system board;
expandable to 1MB using 70ns or 80ns,
256 x 4 bit, 20-pin, DIP DRAM chips
Supports shadowing of system and video
BIOS ROM into RAM
Supports relocation of 256KB of memory
from A0000h to BFFFFh and D0000h to
EFFFFh to extended memory
8KB of internal cache (built into the
microprocessor); supports 64KB, 128KB, or
256KB of external cache using 28-pin,
8x8, 20ns DIP chips or 28-pin, 32x8,
20ns DlP chips
Math coprocessor built into the
microprocessor for DX and DX2 systems
Contained in the 82C491 system controller
along with 64 bytes of CMOS RAM;
backed up by a soldered NiCad
rechargeable battery
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 colors with 1MB of video memory)
12/1/93 Epson EL 486UC+-1