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Use A & oper here
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@ -54,7 +54,7 @@ DEFINE_INST(bit)
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// We're just relying on the modify_status function to do negative
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// and zero; we also need to do overflow, but overflow is checked in
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// a slightly different way with BIT...
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mos6502_modify_status(cpu, MOS_NZ, oper, oper);
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mos6502_modify_status(cpu, MOS_NZ, oper, cpu->A & oper);
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// Normally, overflow is handled by checking if bit 7 flipped from 0
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// to 1 or vice versa, and that's done by comparing the result to
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