XTT 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	330mm x 218mm
I/O Options	None
NPU Options	8087

CONNECTIONS
Purpose	Location	Purpose	Location
Power LED & keylock	JP7	Turbo switch	JP8 pins 3 & 4
Reset switch	JP8 pins 1 & 2	Speaker	JP9

USER CONFIGURABLE SETTINGS
Function		Label	Position
	Wait state select 3 wait states	JP3	Pins 2 & 3 closed
	Wait state select 2 wait states	JP3	Pins 1 & 2 closed
	SW1/5 is set to on	JP5	Closed
	SW1/5 is set to off	JP5	Open
»	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
256KB	(9) 41256	None	None	None
512KB	(9) 41256	(9) 41256	None	None
640KB	(9) 41256	(9) 41256	(9) 41256	None
640KB	(9) 41256	(9) 41256	(9) 4164	(9) 4164

DRAM JUMPER CONFIGURATION
Number of banks with 41256 chips installed	JP4
0	Pins 1 & 3, 2 & 4 closed
1	Pins 2 & 4 closed
2	Pins 1 & 3 closed
3	Open

DRAM SWITCH CONFIGURATION
Banks used	SW1/3	SW1/4
1	On	On
2	On	Off
3	Off	On
4	Off	Off

CPU SPEED SELECTION
Speed	JP6
Switchable through keyboard	Pins 1 & 2 closed
4.77MHz	Open
8MHz	Pins 2 & 3 closed

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

MONITOR SELECTION
Type	SW1/5	SW1/6
EGA	On	On
Color (80 x 25)	On	Off
Color (40 x 25)	Off	On
Monochrome	Off	Off

BIOS SELECTION
Type	JP2
2764	Pins 3 & 15, 4 & 14, 5 & 13, 6 & 12, 7 & 11, 8 & 10 closed
27128	Pins 2 & 15, 3 & 14, 4 & 13, 5 & 12, 6 & 11, 7 & 10 closed
27256	Pins 1 & 15, 2 & 14, 3 & 13, 4 & 12, 5 & 11, 6 & 10 closed