ADD.L D0,D1 ; add two numbers
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SUB.L D1,D0 ; subtract D1 from D0
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MULU D0,D1  ; multiply two unsigned numbers. Use MULS for signed numbers
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DIVU D1,D0  ; Divide D0 by D1. Use DIVS for signed numbers. Upper two bytes of D0 are the remainder, lower two are the integer quotient.
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MODULUS:
DIVU D1,D0
SWAP D0     ;swap the order of the 16-bit halves of D0.
RTS