BUSINESS PRO-MLB1-2 Motherboard Settings and Configuration

Processor	80286
Processor Speed	6/8/10/12/16/20MHz
Chip Set	Texas Instruments
Max. Onboard DRAM	640KB
Cache	None
BIOS	Texas Instruments
Dimensions	220mm x 270mm
I/O Options	Memory card, parallel port, serial port
NPU Options	80287

CONNECTIONS
Purpose	Location	Purpose	Location
Expansion bus connector	J2	64KB module	J18 & J19
Expansion RAM interface connector	J3	64KB module	J16 & J17
Serial port	J8	256KB module	J14 & J15
Parallel port	J9	256KB module	J16 & J17

USER CONFIGURABLE SETTINGS
Function		Jumper/Switch	Position
»	Speaker select external	E1 & E3	Connected to speaker
	Speaker select monitor	E1 & E2	closed
»	Factory configured - do not alter	F1	N/A
»	Factory configured - do not alter	J1	N/A
»	Monitor type select color	SW1/switch 1	on
	Monitor type select monochrome	SW1/switch 1	off
»	Parallel port select LPT1	SW1/switch 2	off
	Parallel port select LPT2	SW1/switch 2	on
»	Serial port select COM1	SW1/switch 3	off
	Serial port select COM2	SW1/switch 3	on

DRAM CONFIGURATION
Size	Bank 0	Bank 1	SW1/Switch 1
512KB	(2) 256KB Modules	NONE	off
640KB	(2) 256KB Modules	(2) 64KB Modules	on

MAIN LOGIC BOARD SELF-TEST LED’S
Green	Yellow	Blue	Item failed	Message
On	On	On	CPU	None
On	On	Off	8142 test keyboard	None
On	Off	On	8254 Timer 1 test	0001
On	Off	Off	ROM CRC check	0002
Off	On	On	CMOS RAM test	0003
Off	On	Off	Mem. refresh test	0004
Off	Off	On	0-256K RAM test	0005
Off	Off	Off	Turbo mode test	0006
Off	Off	Off	Turbo parity error	0008
Off	Off	On	Nonturbo partiy error	0008
On	On	On	8259 test	0007
Off	Off	Off	8254 timer interrupt	0012
On	On	Off	Protected mode test	0020
On	Off	On	8254 timer 2 test	0001
On	Off	Off	DMA test	0051