28   R3 = R1 >> 15;       /* and Y is a 15-bit number */  define
89   R3 = R1 >> 1;		/* Pre-scaled divisor for primitive case */  define
122   R3 = 1;  define
134   R3 = -R1;  define
145   R3 = 0;                         /* Clear partial remainder */  define
152        R3 = R3 << 1 || R5 = [SP];  define
153        R3 = R3 | R6;              /* Include any carry */  define
157        R3 = R3 + R5;              /* Add/sub divsor to partial remainder */  define
171   R3 = R2;                        /* Copy of R2 */  define
261   R3 = R2.L (Z);		/* Q = X' / Y' */  define
269   R3 = 0xFFFF (Z);  define
272   R3 = 1 ;  define