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What do the undocumented assembly opcodes do ?

assembly opcodes undocumented
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What do the undocumented assembly opcodes do ?

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DB,DD,E3,E4,EB,EC,ED,F4,FC, and FD are all undocumented GameBoy assembly language opcodes. Executing any one of these cause every version of the GB to permanently halt operation until power down / power up.

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