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RET : Return from the Procedure:-
At each CALL instruction, the register IP and register CS of the next instruction is pushed to stack, before the control is transferred to the process. In the ending of the procedure, the RET instruction ought to be executed. When it is executed, previously stored content of register IP and CS along with the flags is retrieved into the CS register, IP register and flag registers from the stack and the execution of the main program continues further. The procedure can be a far or a near procedure. In the case of a FAR procedure, the existing contents of SP points to IP and CS register at the time of return. While in the case of a NEAR procedure, it points to only IP. Depending on the type of procedure and the SP contents, the RET instruction has four types.
1. Return within the segment.
2. Return within the segment adding 16-bit immediate displacement to the SP contents.
3. Return the intersegment.
4. Return the intersegment adding 16-bit immediate displacement to the SP contents.
chp 3 of assemly
8251 Programmable/Communication Interface As an instance of a serial interface device let us suppose Intel's 8251 A programmable communication interfaces. The 8251A is diagram
INT N : Interrupt Type N:- In the interrupt structure of 8086/8088, 256 interrupts are distinct equivalent to the types from OOH to FFH. When an instruction INT N is executed,
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write an assembly program to display triangular star like shape
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ADC: Add with Carry:- This instruction performs the similar operation a like ADD instruction, but adds the carry flag bit (which might be set as a result of the previous calculatio
INC: Increment : - This instruction increments the contents of the particular memory or register location by the value 1. All the condition code flags are affected except the carry
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