JETPRO INFOTECH COMPANY, LTD.

MB-3A(MB-333SXA)

Processor	80386SX/CX486SLC
Processor Speed	16/20/25/33MHz
Chip Set	ALI
Max. Onboard DRAM	16MB
SRAM Cache	None
BIOS	AMI/MR
Dimensions	178mm x 218mm
I/O Options	None
NPU Options	80387SX

CONNECTIONS
Purpose	Location	Purpose	Location
External battery	J4	Turbo LED & Turbo switch	J8 pins 1 & 2
Reset switch	J6	Power LED & keylock	J8 pins 4 & 5
Speaker	J7	Power LED & keylock	J9

USER CONFIGURABLE SETTINGS
Function		Jumper	Position
	ADS delay enabled	J5	pins 1 & 2 closed
	ADS delay disabled	J5	pins 2 & 3 closed
»	NPU mode select synchronous with CPU	JP2	pins 1 & 2 closed
	NPU mode select asynchronous with CPU	JP2	pins 2 & 3 closed
»	RTC type select 146818	JP3	open
	RTC type select 1287	JP3	closed
»	Monitor type select color	JP4	pins 2 & 3 closed
	Monitor type select monochrome	JP4	pins 1 & 2 closed
»	Parity check disabled	JP6	open
	Parity check enabled	JP6	closed

CPU SPEED CONFIGURATION
CPU Speed	JP1	JP5
16MHz	pins 1 & 2 closed	pins 1 & 2 closed
20MHz	pins 2 & 3 closed	pins 1 & 2 closed
25MHz	pins 1 & 2 closed	pins 2 & 3 closed
33MHz	pins 2 & 3 closed	pins 2 & 3 closed

DRAM CONFIGURATION
Size	Bank 0	Bank 1
512KB	(2) 256K x 9	NONE
1MB	(2) 256K x 9	(2) 256K x 9
2MB	(2) 1M x 9	NONE
4MB	(2) 1M x 9	(2) 1M x 9
8MB	(2) 4M x 9	NONE
16MB	(2) 4M x 9	(2) 4M x 9

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