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DAS: Decimal Adjust after Subtraction:- This instruction converts the result of subtraction operation of 2 packed BCD numbers to a valid BCD number. The subtraction operation has to be only in the AL. If the lower nibble of AL is higher than the value 9, this instruction will subtract 06 from lower nibble of the AL. If the output of subtraction operation sets the carry flag or if the upper nibble is higher than value 9, it subtracts 60H from the AL. This instruction modifies the CF, AF, PF, SF and ZF flags. The OF is not defined after DAS instruction. The instance is following:
Example :
IMUL: Signed Multiplication: This instruction multiplies a signed byte by a signed bit in source operand e in the register AL or signed word in source operand by signed word in th
Mov ax, [1234h: 4336h + 100]
DEC : A powerful new Alpha 64 bit RISC computer chip was introduced in the year 1977, as new VAX (Virtual Address Extension) Computer. The VAX was 32 bit computer line based on
1) Write an 80x86 assembly language program in EXE file format to do the following tasks: a) Open and read the contents of a file into memory (use at least 1 kB). b) Sort the li
which uses BIOS interrupt INT 21 to read current system time and displays it on the top-left corner of screen.
Flag Manipulation and Processor Control Instructions These instructions control the functioning of available hardware inside the processor chip. These are categorized into thes
Memory Segmentation : The memory in an 8086/8088 based system is organized as segmented memory. In this scheme, the whole physically available memory can be divided into a n
Write a program to mask bits D3D2D1D0 and to set bits D5D4 and to invert bits D7D6 of ax register
Compute the Fibonacci sequence - assembly program: Problem: Fibonacci In this problem you will write a program that will compute the first 20 numbers in the Fibonacci sequ
Machine Level Programs In this section, a few machine levels programming instance, rather then, instruction sequences are presented for comparing the 8086 programming with that
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