CLR A,[W8]+=2,W4,W13                        ;operate on A, store rounded B to W13
CLR A,[W8]+=2,W4                            ;operate on A, no write back
MAC W4*W5,A,[W8]-=2,W4,[W10]+=2,W5,W13      ;operate on A, store rounded B to W13
MSC W4*W5,B,[W11+W12],W5,[W13]+=2           ;operate on B, store rounded A to address
                                            ;pointed to in W13, post-increment W13