.MU5 STA K \ Set K(3 2 1 0) to (A A A A) STA K+1 STA K+2 STA K+3 CLC \ Clear the C flag RTS \ Return from the subroutineName: MU5 [Show more] Type: Subroutine Category: Maths (Arithmetic) Summary: Set K(3 2 1 0) = (A A A A) and clear the C flagContext: See this subroutine in context in the source code References: This subroutine is called as follows: * MULT3 calls MU5

In practice this is only called via a BEQ following an AND instruction, in which case A = 0, so this routine effectively does this: K(3 2 1 0) = 0