Labels:dialog box | reckoner | sidewalk | sky OCR: FFFF 0000 DX DX not DX 0000 0000 AY not AX 0000 FFFF 0000 0000 DX Only i to AX made AX turn over from 0FFFFh to 0 causing carry ono from bit 15 of AX, necessary to increment DX; otherwise the 32-bit incroment of DX:AX comploto aftor adding to AX In effect: DX DX carry out from bit 15 ofAX 000 0000 FIGURE 13.3 n most cases 32. -bit negate performed with not neg dx sbb dx,-1 complete after neg ax 000c 0001
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