Epson Endeavor Shadow RAM, Clock, calendar, Video, Math, Cache, Diskette, Video RAM, Hard disk, coprocessor, Controllers

Video RAM	512KB or 1MB DRAM on main system
	board; 512KB configuration expandable
	to 1MB
Shadow RAM	Supports shadowing of system and video
	BIOS ROM into RAM
Cache	8KB of internal cache (built into the
	microprocessor)
Math	On 4DX/33 and 4DX2/50 systems, math
coprocessor coprocessor built into the microprocessor;
	optional 487 upgrade available for 4SX/25
	system
Clock/	Real-time clock, calendar, and CMOS
calendar	RAM socketed on main system board with
	built-in battery backup

Controllers

Video	Cirrus® VGA controller on main system
	board; provides resolutions up to
	1024 x 768
Diskette	Controller on main system board supports
	up to two diskette drives or one diskette
	drive and one tape drive
Hard disk	Interface on main system board supports
	up to two IDE hard disk drives with
	built-in controllers

A-2 Specifications