The operand of the call instruction initiates an intersegment of intrasegment call
The intrasegment call causes contents of IP to be saved on Stack.
The Operand specifies new value in the IP that is the first instruction in the
Subroutine.
The Intersegment call causes contents of IP and CS to be saved in the stack
and new values to be loaded in IP and CS that identifies the location of the
First instruction of the subroutine.
Execution of RET instruction at the end of the subroutine causes the original
Values of IP and CS to be POPed from stack
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