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Video RAM
1MB VRAM on main system board
Shadow RAM
Automatic shadowing of system and VGA
BIOS ROM into RAM; shadow RAM
address control selectable through SETUP
Cache
Virtual cache
Math
coprocessor
Clock/
calendar
Controllers
Video
Diskette
Hard disk
8KB of internal cache (built into the
microprocessor); cache testing and address
control selectable through SETUP
Epson proprietary VirtualCache feature
automatically creates a “virtual cache”
buffer the size of maximum system
memory
On 4DX2/50 and 4DX2/66 systems, math
coprocessor built into the microprocessor
Real-time clock, calendar, and CMOS
RAM on main system board; separate
battery backup
Chips and Technologies Wingine VGA
controller on main system board; provides
resolutions up to 1024 x 768
Controller on main system board supports
up to two diskette drives or one diskette
drive and one tape drive
Interface on main system board supports
up to two IDE hard disk drives with
built-in controllers
A-2
Specifications