Epson 4+ manual

EPSON Equity 4+

power	hard disk	diskette	power
(SPEED)
	access light	drive	button
light

bay for hard disk, diskette drive, CD-ROM, tape drive, or other

option card slots

power	keyboard		’	’		VGA
inlet	port	I	serial	serial	\
			POti’	pod2		monitor
		mo”s			;F”	poti
		poti

Computer	Specifications
CPU and Memory
32-bit CPU	4SX/25: Intel® i-X, 25 MHz
	microprocessor in PGA-type CPU socket;
	can be upgraded with optional 487SX/25
	or ODP486-25 OverDrive™ processor
	4DX2/50: Intel &36DX2,50 MHz
	microprocessor in PGA-type CPU socket
System speed	Fast and slow speeds available; fast speed
	depends on CPU (25 MHz or 50 MHz),

slow is simulated 8 MHz speed; speed selection through keyboard command; 0 wait state memory access at fast speed

To select slow speed, press the Ctrl, Alt, and - keys simultaneously. To select fast speed, press the Ctrl, Alt, and + keys simultaneously. (Use the - or + key on the numeric keypad.) Default system speed is also user-selectable through SETUP

Memory	4MB RAM standard; expandable using
	1MB, 4MB, or 16MB SIMMs to 36MB
	(maximum); SIMMs must be 36-bit,
	fast-page mode type with 70ns (or faster)
	access speed
ROM	128KB system BIOS, video BIOS, and
	SETUP code located in EPROM on main
	system board
Video RAM	512KB DRAM on main system board,
	expandable to 1MB using 256k x 4-bit
	DRAM ZIPs
Shadow RAM	Supports shadowing of system and video
	BIOS ROM into RAM
Cache	8KB of internal cache (built into the
	microprocessor); expandable to 256KB
	using 8KB or 32KB, 70ns SRAM DIP chips
Math	On 4DX2/50 system, math coprocessor
coprocessor	built into the microprocessor; optional 487
	upgrade available for 4SX/25 system
Clock/calendar Real-time clock, calendar, and CMOS
	RAM socketed on main system board with
	built-in battery backup

Controllers

Video	Cirrus® Logic GD5422 VGA controller on
	main system board; provides true color
	resolutions up to 800 x 600 with 512KB
	standard memory; with 1MB upgraded
	memory, provides resolutions up to
	1280 x 1024
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

Interfaces

Monitor	VGA interface built into main system
	board for analog or multifrequency VGA
	monitor; 15-pin, D-shell connector
Parallel	One standard 8-bit parallel, uni- or bi-
	directional interface built into main system
	board; I/O address selectable through
	SETUP; 25-pin, D-shell connector
Serial	Two RS-232C, programmable,
	asynchronous interfaces built into main
	system board; 9-pin, D-shell connectors

10/1/93 EPSON Equity 4+ 1