HED-988 Motherboard Settings and Configuration

Processor	80286
Processor Speed	12/16/20MHz
Chip Set	HEDAKA
Max. Onboard DRAM	4MB
SRAM Cache	None
BIOS	AMI
Dimensions	330.2mm x 218.4mm
I/O Options	None
NPU Options	80287

CONNECTIONS
Purpose	Location	Purpose	Location
Speaker	CN1	Turbo LED	CN5
Reset switch	CN2	Turbo switch	JP4
Power LED & keylock	CN3	External battery	JP5

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
»	NPU mode select synchronous with CPU	JP1	pins 2 & 3 closed
	NPU mode select synchronous with oscillator installed at OSC1	JP1	pins 1 & 2 closed
»	NPU speed select iOSC/3	JP2	pins 2 & 3 closed
	NPU speed select iOSC/1	JP2	pins 1 & 2 closed
»	Monitor type select color	JP6	pins 2 & 3 closed
	Monitor type select monochrome	JP6	pins 1 & 2 closed
»	CMOS memory normal operation	JP7	open
	CMOS memory clear	JP7	closed
»	Parity check enabled	JP13	open
	Parity check disabled	JP13	closed
Note:When JP7 is closed it also disables the password set in the CMOS

DRAM CONFIGURATION
Size	Bank 0(DIP)	P-0	Bank 1 (DIP)	P-1	Bank 0 (SIPP)	Bank 1 (SIPP)
512KB	(4) 44256	(2) 41256	NONE	NONE	NONE	NONE
512KB	NONE	NONE	NONE	NONE	(2) 256K x 9	NONE
1MB	(4) 44256	(2) 41256	(4) 44256	(2) 41256	NONE	NONE
1MB	NONE	NONE	NONE	NONE	(2) 256K x 9	(2) 256K x 9
1.5MB	(4) 44256	(2) 41256	(4) 44256	(2) 41256	(2) 256K x 9	NONE
2MB	(4) 44256	(2) 41256	(4) 44256	(2) 41256	NONE	NONE
2MB	NONE	NONE	NONE	NONE	(2) 1M x 9	NONE
4MB	NONE	NONE	NONE	NONE	(2) 1M x 9	(2) 1M x 9

DRAM JUMPER CONFIGURATION
Size	Jumper JP8	Jumper JP9	Jumper JP10	Jumper JP11	Jumper JP12
512KB	open	closed	closed	closed	closed
1MB	closed	open	closed	closed	closed
1.5MB	open	open	closed	closed	closed
2MB	closed	closed	open	closed	closed
2MB 1	closed	closed	open	closed	open
4MB	open	closed	open	closed	open
Note 1 :Setting represents (2) 1M x 9 SIPPs installed.