TURBO MAINBOARD 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
Operating mode interface	P3	Keyboard connector	P5
Speaker	P4	Reset switch	SW2

USER CONFIGURABLE SETTINGS
Function		Label	Position
	I/O address is C0H (bit 0 low = turbo mode; high = normal mode)	E1	Pins 1 & 2 closed
	I/O address is 061H (bit 2 low = turbo mode; high = normal mode)	E1	Pins 2 & 3 closed
	CPU changes speed during disk drive access	E6	Closed
	CPU does not change speed during disk drive access	E6	Open
	Boot memory test enabled	SW1/1	On
	Boot memory test disabled	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
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/SWITCH CONFIGURATION
Size	E4	SW1/3	SW1/4
64KB	Open	On	On
128KB	Open	Off	On
192KB	Open	On	Off
256KB	Open	Off	Off
256KB	Closed	On	On
512KB	Closed	Off	On
576KB	Closed	On	Off
640KB	Closed	Off	Off

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
None	On	On
Color (80 x 25)	On	Off
Color (40 x 25)	Off	On
Monochrome	Off	Off

ROM SELECTION
U25 address	U26 address	E2	E3
F6000H - FDFFFH	FE000H - FFFFFH	Closed	Closed
F4000H - FBFFFH	FC0000H - FFFFFH	Closed	Open
F0000H - F7FFFH	F8000H - FFFFFH	Open	Open