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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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TX-1
Manufactured by Tatsumi, Released in 1983
ROM Version: TX-1 (Japan rev. B)
Print
Dip Switch:DS.1
12345678FunctionOption
        Bonus Adder2 Coin Units for 1 Credit
        3 Coin Units for 1 Credit
        4 Coin Units for 1 Credit
        4 Coin Units for 2 Credit
        5 Coin Units for 1 Credit
        DifficultyA (Easiest)
        Game TimeA (Longest)
        DifficultyB
        Game TimeB
        C*
        DifficultyC
        D*
        Game TimeD (Shortest)
        DifficultyE
        F
        Bonus AdderFree Play
        DifficultyG
        H (Hardest)
        Bonus AdderNo Bonus
        No Bonus*
Dip Switch:DS.2
12345678FunctionOption
Off       UnknownOff*
On       On
 OnOn     Right Coin Mechanism1 Coin for 1 Coin Unit*
 OnOff     1 Coin for 4 Coin Units
 OffOn     1 Coin for 5 Coin Units
 OffOff     1 Coin for 6 Coin Units
   On    Left Coin Mechanism1 Coin for 1 Coin Unit*
   Off    1 Coin for 2 Coin Units
    OnOn  Game Cost1 Coin Unit for 1 Credit*
    OnOff  2 Coin Units for 1 Credit
    OffOn  3 Coin Units for 1 Credit
    OffOff  4 Coin Units for 1 Credit
Dip Switch:PPI_PORTD
12345678FunctionOption
    OffOnOnOnSound PCB Jumper (DS.3)1
    OnOffOnOn2
    OnOnOffOn3
    OnOnOnOff4*
ROM Version: TX-1 (Japan rev. C)
Print
Dip Switch:DS.1
12345678FunctionOption
        Bonus Adder2 Coin Units for 1 Credit
        3 Coin Units for 1 Credit
        4 Coin Units for 1 Credit
        4 Coin Units for 2 Credit
        5 Coin Units for 1 Credit
        DifficultyA (Easiest)
        Game TimeA (Longest)
        B
        DifficultyB
        C
        Game TimeC*
        DifficultyD*
        Game TimeD (Shortest)
        DifficultyE
        F
        Bonus AdderFree Play
        DifficultyG
        H (Hardest)
        Bonus AdderNo Bonus*
        No Bonus
Dip Switch:DS.2
12345678FunctionOption
Off       UnknownOff*
On       On
 OnOn     Right Coin Mechanism1 Coin for 1 Coin Unit*
 OnOff     1 Coin for 4 Coin Units
 OffOn     1 Coin for 5 Coin Units
 OffOff     1 Coin for 6 Coin Units
   On    Left Coin Mechanism1 Coin for 1 Coin Unit*
   Off    1 Coin for 2 Coin Units
    OnOn  Game Cost1 Coin Unit for 1 Credit*
    OnOff  2 Coin Units for 1 Credit
    OffOn  3 Coin Units for 1 Credit
    OffOff  4 Coin Units for 1 Credit
Dip Switch:PPI_PORTD
12345678FunctionOption
    OffOnOnOnSound PCB Jumper (DS.3)1
    OnOffOnOn2
    OnOnOffOn3
    OnOnOnOff4*
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