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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Manufactured by Sega, Released in 1988
ROM Version: Tetris (Japan, System E)
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Dip Switch:SW2
12345678FunctionOption
 Off      Demo SoundsOff
 On      On*
    OnOff  DifficultyEasy
    OffOn  Hard
    OnOn  Hardest
    OffOff  Normal*
ROM Version: Tetris (set 1, Japan, System 16B) (FD1094 317-0091)
Print
Dip Switch:SW2
12345678FunctionOption
 Off      Demo SoundsOff
 On      On*
    OnOff  DifficultyEasy
    OffOn  Hard
    OnOn  Hardest
    OffOff  Normal*
ROM Version: Tetris (set 2, Japan, System 16B) (FD1094 317-0092)
Print
Dip Switch:SW2
12345678FunctionOption
 Off      Demo SoundsOff
 On      On*
    OnOff  DifficultyEasy
    OffOn  Hard
    OnOn  Hardest
    OffOff  Normal*
ROM Version: Tetris (set 3, Japan, System 16A) (FD1094 317-0093a)
Print
Dip Switch:SW2
12345678FunctionOption
 Off      Demo SoundsOff
 On      On*
    OnOff  DifficultyEasy
    OffOn  Hard
    OnOn  Hardest
    OffOff  Normal*
ROM Version: Tetris (set 4, Japan, System 16A) (FD1094 317-0093)
Print
Dip Switch:SW2
12345678FunctionOption
 Off      Demo SoundsOff
 On      On*
    OnOff  DifficultyEasy
    OffOn  Hard
    OnOn  Hardest
    OffOff  Normal*
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