HED-918 Motherboard Settings and Configuration

Processor	8088/V20
Processor Speed	4.77/10MHz
Chip Set	None
Max. Onboard DRAM	640KB
Cache	None
BIOS	AMI
Dimensions	217mm x 166mm
I/O Options	None
NPU Options	8087

CONNECTIONS
Purpose	Location	Purpose	Location
Power LED	CN2	Turbo LED	CN6
Speaker	CN3	External battery	CN7A
Reset switch	CN4	Keylock	CN8
Turbo switch	CN5

USER CONFIGURABLE SETTINGS
Function		Jumper/Switch	Position
»	CPU type select Intel 8088	JP2	pins 1 & 2 closed
	CPU type select NEC V-20	JP2	pins 2 & 3 closed
»	Factory configured - do not alter	SW1/1	Off
»	NPU disabled	SW1/2	On
	NPU enabled	SW1/2	Off

DRAM CONFIGURATION
Size	44256 Chips	411000 Chips
0KB	NONE	NONE
128KB	U7	NONE
256KB	U6 & U7	NONE
384KB	U5, U6 & U7	NONE
512KB	U4, U5, U6 & U7	NONE
512KB	NONE	U4, U5, U6 & U7
640KB	U3, U4, U5, U6 & U7	NONE
640KB	U3	U4, U5, U6 & U7

DRAM JUMPER/SWITCH CONFIGURATION
Size	JP1	SW1/3	SW1/4
0KB	pins 1 & 2 closed	On	On
128KB	pins 1 & 2 closed	Off	On
256KB	pins 1 & 2 closed	Off	On
384KB	pins 1 & 2 closed	Off	On
512KB	pins 1 & 2 closed	Off	On
512KB	pins 2 & 3 closed	Off	On
640KB	pins 1 & 2 closed	On	Off
640KB	pins 2 & 3 closed	On	Off

FLOPPY DRIVE CONFIGURATION
Drives installed	SW1/7	SW1/8
1	On	On
2	Off	On
3	On	Off
4	Off	Off

MONITOR CONFIGURATION
Type	SW1/3	SW1/4
None	On	On
40 x 25 color	Off	On
80 x 25 color	On	Off
Monochrome	Off	Off