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MB879 User’s Manual 17
J2: ATX Power Supply Connector
Signal Name Pin # Pin # Signal Name
3.3V 11 1 3.3V
-12V 12 2 3.3V
Ground 13 3 Ground
PS-ON 14 4 +5V
Ground 15 5 Ground
Ground 16 6 +5V
Ground 17 7 Ground
-5V 18 8 Power good
+5V 19 9 5VSB
11 1
20 10
+5V 20 10 +12V
J3: TV Out Header (RCA & S-Video)
Signal Name Pin Pin Signal Name
NC 1 2 NC
Y 3 4 Ground
C 5 6 Ground
COMP 7 8 Ground
J4: COM2, COM3, COM4 Serial Ports
Pin # Signal Name (RS-232)
1 DCD, Data carrier detect
2 RXD, Receive data
3 TXD, Transmit data
4 DTR, Data terminal ready
5 Ground
6 DSR, Data set ready
7 RTS, Request to send
8 CTS, Clear to send
9 RI, Ring indicator
10 No Connect.