Add overflow_error
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@@ -64,7 +64,7 @@ mul_FAC2_FAC1:
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sta RESHO+1
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@2:
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lda RESHO+1
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+bne set_FAC1_max ; overflow
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+bne overflow_error ; overflow
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lda RESHO+0
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sta FAC1_exponent
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@@ -124,7 +124,7 @@ mul_FAC2_FAC1:
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lda FAC1_exponent
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clc
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adc #$08
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+bcs set_FAC1_max ; branch if overflow
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+bcs overflow_error ; branch if overflow
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sta FAC1_exponent
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jmp normal_FAC1
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