XT TURBO 640K Motherboard Settings and Configuration

Processor	8088
Processor Speed	4.77/8MHz
Chip Set	Unidentified
Video Chip Set	None
Maximum Onboard Memory	640KB
Maximum Video Memory	None
Cache	None
BIOS	Unidentified
Dimensions	305mm x 216mm
I/O Options	None
NPU Options	8087

CONNECTIONS
Purpose	Location	Purpose	Location
Speaker	JP1	Turbo switch	Z14
Reset switch	JP3

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	Factory configured - do not alter (turbo BIOS)	JP4	Unidentified
»	Factory configured - do not alter	SW1/1	Off
	NPU not installed	SW1/2	On
	NPU installed	SW1/2	Off

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3
128KB	(9) 4164	None	None	None
256KB	(9) 41256	None	None	None
512KB	(9) 41256	(9) 41256	None	None
640KB	(9) 41256	(9) 41256	(9) 4164	(9) 4164

DRAM SWITCH CONFIGURATION
Size	SW1/3	SW1/4
128KB	Off	On
192KB	On	Off
256KB or above	Off	Off

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

MONITOR SELECTION
Setting	SW1/5	SW1/6
None	On	On
Color (40 x 20)	Off	On
Color (80 x 25)	On	Off
Monochrome	Off	Off