The Defender Emulator in Java - Norbert Kehrer (January 2002)
The keys:
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Up: Move up
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Down: Move down
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Left, Right: Thrust
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X: Reverse
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Ctrl: Fire
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Space: Smart bomb
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C: Hyper Space
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1: 1 Player start
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2: 2 Players start
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3: Insert coin slot 1
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4: Insert coin slot 2
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5: Insert coin slot 3
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Keypad +: Increase frame skipping rate
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Keypad -: Decrease frame skipping rate
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F7 and F8: Change overall speed
Hint: Be patient, the startup sequence takes some time (self-test of the Defender unit).