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This result does show overflow. Assembler programs are not costly; they are quite cheap. Multiplication and division are more complicated than addition and subtraction, and require the use of two new, special purpose registers, the hi and lo registers. 8051 provides MULABinstruction. So a simple check for overflow when two positive numbers are multiplied to see if the hi register is all 0's: if it is all 0's the result did not overflow, otherwise the result did overflow. (\.eW]Qk!)p[vG}PHg.xWN^O/^Y[~XO 0 After division, the quotient goes to the AL register and the remainder goes to the AH register. The MUL (Multiply) instruction handles unsigned data and the IMUL (Integer Multiply) handles signed data. What's the cheapest way to buy out a sibling's share of our parents house if I have no cash and want to pay less than the appraised value? Result is stored at address 3050 and 3051. INX H will increment the address of HL pair by one and make it 2051H. You can replace these shifts with additions (e.g. Multiplying two 32-bit numbers together gives rise to a 64-bit number. Syntax The syntax for the MUL/IMUL instructions is as follows MUL/IMUL multiplier AAM Used to adjust ASCII codes after multiplication. 0000000016 00000 n ; Set the initial value of the number used for the and operation, ; Loop 4 times. Thus writing a program in assembly language has advantages over writing the same in a machine language. Could a subterranean river or aquifer generate enough continuous momentum to power a waterwheel for the purpose of producing electricity? Thanks for contributing an answer to Stack Overflow! So if there is a valid answer, it must be contained in the lower 32 bits of the answer. To see this, consider multiplication in base 10. After division, the 16-bit quotient goes to the AX register and the 16-bit remainder goes to the DX register. In that microprocessor, we need to use repetitive ADD operations to get the result of the multiplication.