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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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Space Ace
Manufactured by Cinematronics, Released in 1983
ROM Version: Space Ace (US Rev. A)
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Dip Switch:A
12345678FunctionOption
On       Coinage2 Coins/1 Credit*
Off       3 Coins/1 Credit
 On      Lives3*
 Off      5
  On     DifficultyEasy*
  Off     Hard
  Off     Difficulty ModeMode 1
  On     Mode 2*
   Off    Difficulty Rank IncreaseFast
   On    Engineering ModeOff*
   Off    On
   On    Difficulty Rank IncreaseSlow*
    On   Demo SoundsNo
    On   2 Credits/Free playOff*
    Off   On
    Off   Demo SoundsYes*
     Off  Demo Sounds Frequency1 out of eight times
     On  Lives3
     Off  5*
     On  Demo Sounds FrequencyAll the time*
      On Pay as you goOff*
      Off On
Dip Switch:B
12345678FunctionOption
On       LD PlayerLD-PR7820
Off       LDV-1000*
 Off      Demo SoundsOff
 On      On*
  On     Unlimited DirksOff*
  Off     On
   On    Joystick Feedback SoundOff
   Off    On*
    On   Free PlayNo*
    Off   Yes
     On  Unlimited LivesNo*
     Off  Yes
      On Enable Frame DisplayOff*
      Off On
     OnOn Pay as you go optionsPAYG1
     OffOn PAYG2
     OnOff PAYG3
     OffOff PAYG4*
When Difficulty Mode set to Mode 1
    Off  OffDifficultyEasy
    Off  OffEasy
    On  OffEasy
    On  OffEasy
    Off  OnEasy*
    On  OnHard
    On  OnIncrease after 5
    Off  OnIncrease after 9*
ROM Version: Space Ace (US Rev. A2)
Print
Dip Switch:A
12345678FunctionOption
On       Coinage2 Coins/1 Credit*
Off       3 Coins/1 Credit
 On      Lives3*
 Off      5
  On     DifficultyEasy*
  Off     Hard
  Off     Difficulty ModeMode 1
  On     Mode 2*
   Off    Difficulty Rank IncreaseFast
   On    Engineering ModeOff*
   Off    On
   On    Difficulty Rank IncreaseSlow*
    On   Demo SoundsNo
    On   2 Credits/Free playOff*
    Off   On
    Off   Demo SoundsYes*
     Off  Demo Sounds Frequency1 out of eight times
     On  Lives3
     Off  5*
     On  Demo Sounds FrequencyAll the time*
      On Pay as you goOff*
      Off On
Dip Switch:B
12345678FunctionOption
On       LD PlayerLD-PR7820
Off       LDV-1000*
 Off      Demo SoundsOff
 On      On*
  On     Unlimited DirksOff*
  Off     On
   On    Joystick Feedback SoundOff
   Off    On*
    On   Free PlayNo*
    Off   Yes
     On  Unlimited LivesNo*
     Off  Yes
      On Enable Frame DisplayOff*
      Off On
     OnOn Pay as you go optionsPAYG1
     OffOn PAYG2
     OnOff PAYG3
     OffOff PAYG4*
When Difficulty Mode set to Mode 1
    Off  OffDifficultyEasy
    Off  OffEasy
    On  OffEasy
    On  OffEasy
    Off  OnEasy*
    On  OnHard
    On  OnIncrease after 5
    Off  OnIncrease after 9*
ROM Version: Space Ace (US Rev. A3)
Print
Dip Switch:A
12345678FunctionOption
On       Coinage2 Coins/1 Credit*
Off       3 Coins/1 Credit
 On      Lives3*
 Off      5
  On     DifficultyEasy*
  Off     Hard
  Off     Difficulty ModeMode 1
  On     Mode 2*
   Off    Difficulty Rank IncreaseFast
   On    Engineering ModeOff*
   Off    On
   On    Difficulty Rank IncreaseSlow*
    On   Demo SoundsNo
    On   2 Credits/Free playOff*
    Off   On
    Off   Demo SoundsYes*
     Off  Demo Sounds Frequency1 out of eight times
     On  Lives3
     Off  5*
     On  Demo Sounds FrequencyAll the time*
      On Pay as you goOff*
      Off On
Dip Switch:B
12345678FunctionOption
On       LD PlayerLD-PR7820
Off       LDV-1000*
 Off      Demo SoundsOff
 On      On*
  On     Unlimited DirksOff*
  Off     On
   On    Joystick Feedback SoundOff
   Off    On*
    On   Free PlayNo*
    Off   Yes
     On  Unlimited LivesNo*
     Off  Yes
      On Enable Frame DisplayOff*
      Off On
     OnOn Pay as you go optionsPAYG1
     OffOn PAYG2
     OnOff PAYG3
     OffOff PAYG4*
When Difficulty Mode set to Mode 1
    Off  OffDifficultyEasy
    Off  OffEasy
    On  OffEasy
    On  OffEasy
    Off  OnEasy*
    On  OnHard
    On  OnIncrease after 5
    Off  OnIncrease after 9*
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