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hMultiplicand is four bytes internally, but the high byte is always 0 since allowing four-byte multiplicands could overflow hProduct.
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@ -4,7 +4,7 @@ _Multiply::
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ld b, a
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xor a
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ldh [hProduct], a
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ldh [hMultiplicand - 1], a
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ldh [hMathBuffer + 1], a
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ldh [hMathBuffer + 2], a
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ldh [hMathBuffer + 3], a
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@ -36,7 +36,7 @@ _Multiply::
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ldh a, [hMathBuffer + 1]
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ld c, a
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ldh a, [hProduct]
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ldh a, [hMultiplicand - 1]
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adc c
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ldh [hMathBuffer + 1], a
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@ -58,9 +58,9 @@ _Multiply::
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rla
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ldh [hMultiplicand + 0], a
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ldh a, [hProduct]
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ldh a, [hMultiplicand - 1]
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rla
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ldh [hProduct], a
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ldh [hMultiplicand - 1], a
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jr .loop
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