AT-TURBO 286 Motherboard Settings and Configuration

Processor	80286
Processor Speed	6/8/10MHz
Chip Set	Unidentified
Video Chip Set	None
Maximum Onboard Memory	1MB
Maximum Video Memory	None
Cache	None
BIOS	Unidentified
Dimensions	355mm x 304mm
I/O Options	None
NPU Options	80287

CONNECTIONS
Purpose	Location	Purpose	Location
Speaker	J19	External battery	J21
Power LED & keylock	J20	Reset switch	J24

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	Factory configured - do not alter (wait state select)	J23	Unidentified
	Monitor type select color	SW1	Pins 2 & 3 closed
	Monitor type select monochrome	SW1	Pins 1 & 2 closed
	BIOS type select 27128	U57	Pins 1 & 8, 2 & 7 closed
	BIOS type select 27256	U57	Pins 3 & 6, 4 & 5 closed

DRAM CONFIGURATION
Size	Type	Bank 0	Bank 1
512KB	512KB	(9) 41256	None
640KB	640KB	(9) 41256	(9) 4164
1MB	640KB internal/384KB expansion	(9) 41256	(9) 41256
1MB	512KB internal/512KB expansion	(9) 41256	(9) 41256

DRAM JUMPER CONFIGURATION
Size	J17	J18
512KB	Pins 2 & 3 closed	Pins 2 & 3 closed
640KB	Pins 1 & 2 closed	Pins 2 & 3 closed
1MB	Pins 1 & 2 closed	Pins 1 & 2 closed
1MB	Pins 2 & 3 closed	Pins 1 & 2 closed

CPU SPEED SELECTION
Speed	J25
6MHz	Pins 2 & 3 closed
8MHz	Pins 1 & 2 closed
10MHz	Pins 1 & 2 closed