MGX7520 (BABY AT) Motherboard Settings and Configuration

Device Type	Mainboard
Processor	Cyrix GXM
Processor Speed	Unidentified
Chip Set	Cyrix CX5520
Maximum Onboard Memory	256MB (SDRAM supported)
Video Chip Set	Cyrix (integrated)
Audio Chip Set	Cyrix (integrated)
Maximum Video Memory	Unidentified
Cache	None
BIOS	Award
Dimensions	220mm x 220mm
I/O Options	32-bit PCI slots (2), floppy drive interface, game interface, green PC connector, IDE interfaces (2), parallel port, PS/2 mouse interface, serial ports (2), ATX power connector, MIDI/TV out connector, audio in - CD-ROMs (2), soft off power supply

CONNECTIONS
Purpose	Location	Purpose	Location
ATX-P connector	ATXP	Audio in - CD-ROM	J8
Parallel port	CN1	Audio in - CD-ROM	J9
Serial port 2	CN3	PS/2 mouse interface	JP5
Serial port 1	CN4	Power LED & keylock	JP7/pins 1 - 5
Floppy drive interface	CN5	Green PC LED	JP7/pins 8 & 9
IDE interface 2	CN6	Soft off power supply	JP7/pins 10 & 11
IDE interface 1	CN7	Reset switch	JP7/pins 12 & 24
Game interface	CN8	Speaker	JP7/pins 13 - 16
MIDI/TV out connector	CN9	IDE interface LED	JP7/pins 20 & 21
Chassis fan power	FAN	Green PC connector	JP7/pins 22 & 23
IR connector	IR1	32-bit PCI slots	PC1 – PC2

USER CONFIGURABLE SETTINGS
Function		Label	Position
»	Factory configured - do not alter	J1	Unidentified
»	CMOS memory normal operation	JP13	Pins 1 & 2 closed
	CMOS memory clear	JP13	Pins 2 & 3 closed
»	Factory configured - do not alter	JP14	Unidentified

DIMM CONFIGURATION
Size	Bank 0	Bank 1
8MB	(1) 1M x 64	None
16MB	(1) 2M x 64	None
16MB	(1) 1M x 64	(1) 1M x 64
24MB	(1) 2M x 64	(1) 1M x 64
32MB	(1) 4M x 64	None
32MB	(1) 2M x 64	(1) 2M x 64
40MB	(1) 4M x 64	(1) 1M x 64
48MB	(1) 4M x 64	(1) 2M x 64
64MB	(1) 8M x 64	None
64MB	(1) 4M x 64	(1) 4M x 64
72MB	(1) 8M x 64	(1) 1M x 64
80MB	(1) 8M x 64	(1) 2M x 64
96MB	(1) 8M x 64	(1) 4M x 64

DIMM CONFIGURATION (CON’T)
Size	Bank 0	Bank 1
128MB	(1) 16M x 64	None
128MB	(1) 8M x 64	(1) 8M x 64
136MB	(1) 16M x 64	(1) 1M x 64
144MB	(1) 16M x 64	(1) 2M x 64
160MB	(1) 16M x 64	(1) 4M x 64
192MB	(1) 16M x 64	(1) 8M x 64
256MB	(1) 16M x 64	(1) 16M x 64
Note: Board accepts SDRAM memory.

VIDEO MEMORY CONFIGURATION

Note: the size & location of the video memory is unidentified.

CPU INTERNAL CLOCK SPEED SELECTION
Speed	JP1
6x	Pins 1 & 3, 4 & 6 closed
7x	Pins 2 & 4, 3 & 5 closed

CPU SPEED SELECTION
Speed	JP4
30MHz	Pins 3 & 5, 4 & 6 closed
33MHz	Pins 1 & 3, 4 & 6 closed

CPU VOLTAGE SELECTION
Voltage	V core	JP2
3.3v	2.9v/3.6v	Pins 1 & 2, 4 & 5 closed
2.9v/3.6v	2.9v/3.6v	Pins 2 & 3, 5 & 6 closed