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Interpose

Autofire

Pause game. Then push [Enter] and quickly type "argh" at the console window.

Extra life

Pause game. Then push [Enter] and quickly type "tran" at the console window.

Full shield

Pause game. Then push [Enter] and quickly type "fisk" at the console window.

Money

Pause game. Then push [Enter] and quickly type "1501" at the console window.