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Controllers – Epson 2000 User Manual

Page 99

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Video RAM

Shadow RAM

Memory
relocation

Cache

Math

coprocessor

Clock/
calendar

Controllers

Video

Diskette

Hard disk

512KB DRAM on main system board;

expandable to 1MB using four 4 x 256
DIP-type DRAM chips

Supports shadowing of system and video

BIOS ROM into RAM

Supports relocation of 128KB of memory

from A0000h to BFFFFh

1KB of internal cache on processor

Cyrix 83S87-25

Real-time clock, calendar, and 114 bytes of

CMOS RAM socketed on main system

board with built-in rechargeable NiCad
battery backup

Cirrus Logic® GD5426 high speed super

VGA local bus controller; provides

TrueColor support and resolutions up to

1280 x 1024 in 16 colors (interlaced) with
1MB of video RAM

Controller on main system board supports

two diskette drives or one diskette drive

and one tape drive

IDE interface on main system board

supports up to two IDE hard disk drives

with built-in controller; BIOS provides
hard disk auto-sensing function

A-2

Specifications