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12 Apr 2017
16 Nov 2011 I must say, I've never seen a dafter instruction spec. If you examine the table carefully, you will see that the effect of the instruction depends only on the C and H flags and the value in the accumulator -- it doesn't depend on the previous instruction at all. Also, it doesn't divulge what happens if, for example, C="0" , H="1" , and the
Adjusts the sum of two packed BCD values to create a packed BCD result. The AL register is the implied source and destination operand. The DAA instruction is only useful when it follows an ADD instruction that adds (binary addition) two 2-digit, packed BCD values and stores a byte result in the AL register.
Although this instruction should be used immediately after the addition instruction, it could be used later as long as no other intervening instruction would have changed the AF or CF flags (such as a mov instruction). Example 1: mov al,38h ;packed decimal "38" add al,45h ;add packed decimal "45" daa ;AL = 7Dh -> 83h
3 Jun 2014 The DAA instruction (Decimal Adjust Accumulator) allows conversion of the 8-bit accumulator value to Binary Coded Decimal (BCD). Example 1: mov al,38h ;packed decimal "38" add al,45h ;add packed decimal "45" daa ;AL = 7Dh -> 83h (with CF clear = 83 packed decimal) AL CF AF ; after addition 7Dh
The DAA instruction is only useful when it follows an ADD instruction that adds (binary addition) two 2-digit, packed BCD values and stores a byte result in the AL Example. ADD AL, BL Before: AL="79H" BL="35H" EFLAGS(OSZAPC)=XXXXXX After: AL="AEH" BL="35H" EFLAGS(0SZAPC)=110000. DAA Before: AL="AEH"
This instruction assumes the AL register as the source and the destination, and hence it requires no operand. The effect of DAS (Decimal Adjust after Subtraction) instruction is similar to that of DAA, except that it is used after a subtraction instruction. For example in the following program, that NUM1 and NUM2 are decimal
The aaa and daa instructions modify the result of a binary addition to correct it for ASCII or decimal arithmetic. For example, to add two BCD values, you would add them as though they were binary numbers and then execute the daa instruction afterwards to correct the results.
INR: - The contents of the designated register or memory) are incremented by 1 and the result is stored in the same place. If the operand is a memory location, its location is specified by the contents of the HL registers. Eg: -INR B( the content of register B is incremented by 1. INR M( the content of memory location pointed by
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