Sega Genesis 2 - Manual (Page 12)

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CN4
Sega Naomi System
Filter Board Information
Connector Description etc.
PSW2 PSW1
CN3
CN2 CN1
DIPSW1
Power Connectors VGA Level
Video Out
Preamp Level
Audio Out
Test
Switch
Service
Switch
1
1
2
2
3
3
4
Setting for High
Resolution 31KHZ
1 -4 off
Setting for Standard
Resolution 15KHZ
1 on 2-4 off.