TURBO 640 Motherboard Settings and Configuration

Processor	8088-2
Processor Speed	8MHz
Chip Set	None
Max. Onboard DRAM	640K
Cache	None
BIOS	DTK/ERSO
Dimensions	330mm x 218mm
I/O Options	None
NPU Options	8087-2

CONNECTIONS
Purpose	Location	Purpose	Location
Reset switch	JP1	Turbo switch	JP5
Power LED & turbo LED	JP2	Keylock	JP8
Speaker	JP4

USER CONFIGURABLE SETTINGS
Function		Jumper/Switch	Position
»	Factory configured - do not alter	SW1/switch 1	Off
»	NPU absent	SW1/switch 2	Off
	NPU present	SW1/switch 2	On

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3
64KB	(9) 4164	NONE	NONE	NONE
128KB	(9) 4164	(9) 4164	NONE	NONE
192KB	(9) 4164	(9) 4164	(9) 4164	NONE
256KB	(9) 4164	(9) 4164	(9) 4164	(9) 4164
256KB	(9) 41256	NONE	NONE	NONE
512KB	(9) 41256	(9) 41256	NONE	NONE
576KB	(9) 41256	(9) 41256	(9) 4164	NONE
640KB	(9) 41256	(9) 41256	(9) 4164	(9) 4164

DRAM JUMPER CONFIGURATION
Size	JPA	JPB	JPC	JPD	JPE	JPF
64KB	Closed	Closed	Open	Open	Open	Closed
128KB	Closed	Closed	Open	Open	Open	Closed
192KB	Closed	Closed	Open	Open	Open	Closed
256KB (using 4164)	Closed	Closed	Open	Open	Open	Closed
256KB (using 41256)	Open	Open	Closed	Closed	Closed	Open
512KB	Open	Open	Closed	Closed	Closed	Open
576KB	Open	Open	Closed	Closed	Closed	Open
640KB	Open	Open	Closed	Closed	Closed	Open

CPU SPEED CONFIGURATION
Setting	JP6	JP7
Switchable from turbo switch	Closed	Open
Switchable from keyboard	Open	Closed

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

MONITOR CONFIGURATION
Type	SW1/5	SW1/6
EGA or none	On	On
40 x 25 CGA	Off	On
80 x 25 CGA	On	Off
Monochrome	Off	Off