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Maths (Arithmetic): MLU2

[BBC Micro disc version, Docked]

Name: MLU2 [Show more] Type: Subroutine Category: Maths (Arithmetic) Summary: Calculate (A P) = |A| * Q
Context: See this subroutine in context in the source code References: No direct references to this subroutine in this source file

Do the following multiplication of a sign-magnitude 8-bit number P with an unsigned number Q: (A P) = |A| * Q
.MLU2 AND #%01111111 \ Clear the sign bit in P, so P = |A| STA P \ Fall through into MULTU to calculate: \ \ (A P) = P * Q \ = |A| * Q