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The following are the Dip Switch settings based off of MAME 0.180 source code.
 
Use this information at your own risk!  The information was parsed from the MAME source code and could contain errors as to the state, order or descriptions of what the switches do.  If you find an error, please let me know on the Contact Us form and I will work on correcting the issue. 
 
 
 
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Lock-On
Manufactured by Tatsumi, Released in 1986
ROM Version: Lock-On (rev. C)
Print
Dip Switch:DSW
12345678FunctionOption
        Enable H/W Tests MenuOff*
        On
Dip Switch:SW1
12345678FunctionOption
OffOn      Lives2
OnOn      3*
OnOff      4
OffOff      5
  OffOn    DifficultyEasy
  OnOff    Hard
  OffOff    Hardest
  OnOn    Medium*
    On   Bonus Life150K & every 200K
    Off   200K & every 200K*
     Off  Allow ContinueNo
     On  Yes*
      On Demo SoundsOff
      Off On*
Dip Switch:SW2
12345678FunctionOption
        Coin B1 Coin/1 Credit*
        Coin A1 Coin/1 Credit*
        1 Coin/2 Credits
        Coin B1 Coin/2 Credits
        1 Coin/3 Credits
        1 Coin/4 Credits
        1 Coin/5 Credits
        Coin A1 Coin/5 Credits
        Coin B1 Coin/6 Credits
        Coin A1 Coin/6 Credits
        2 Coins/1 Credit
        Coin B2 Coins/1 Credit
        Coin A2 Coins/3 Credits
        3 Coins/1 Credit
        Coin B4 Coins/1 Credit
        Coin AFree Play
Dip Switch:YM2203
12345678FunctionOption
      Off Jumper 1Off
      On On*
       OffJumper 0Off
       OnOn*
ROM Version: Lock-On (rev. E)
Print
Dip Switch:DSW
12345678FunctionOption
        Enable H/W Tests MenuOff*
        On
Dip Switch:SW1
12345678FunctionOption
OffOn      Lives2
OnOn      3*
OnOff      4
OffOff      5
  OffOn    DifficultyEasy
  OnOff    Hard
  OffOff    Hardest
  OnOn    Medium*
    On   Bonus Life150K & every 200K
    Off   200K & every 200K*
     Off  Allow ContinueNo
     On  Yes*
      On Demo SoundsOff
      Off On*
Dip Switch:SW2
12345678FunctionOption
        Coin B1 Coin/1 Credit*
        Coin A1 Coin/1 Credit*
        1 Coin/2 Credits
        Coin B1 Coin/2 Credits
        1 Coin/3 Credits
        1 Coin/4 Credits
        Coin A1 Coin/5 Credits
        Coin B1 Coin/5 Credits
        1 Coin/6 Credits
        Coin A1 Coin/6 Credits
        Coin B2 Coins/1 Credit
        Coin A2 Coins/1 Credit
        2 Coins/3 Credits
        3 Coins/1 Credit
        Coin B4 Coins/1 Credit
        Coin AFree Play
Dip Switch:YM2203
12345678FunctionOption
      Off Jumper 1Off
      On On*
       OffJumper 0Off
       OnOn*
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