Assembly emulator 8086 code#

Jump if Less than or Equal/Jump if Not Greater Jump if Less Than/Jump if Not Greater Than or Equal Jump if Greater or Equal/Jump if Not Less Than Jump if Greater/Jump if Not Less Than or Equal Jump if Below or Equal/ Jump if Not Above Jump if Below/ Jump if Not Above or Equal Jump if Above or Equal/ Jump if Not Below/Jump if No Carry Table below shows the mnemonics of all the conditional branches instructions. List of 8086 Conditional Branch Instructions If the condition is not satisfied, then the program continues in a sequential manner. The flag conditions are checked depending upon the instruction, if they are true the program control is transferred to the memory address pointed by the IP register. The target address must be within the -128 to +127 bytes of IP. It is sign-extended to 16-bits and added to the contents of IP register. It is a 2-byte instruction consisting of 1-Byte Opcode and 1-byte Label. The syntax of these instructions is: Opcode LABEL The conditional jumps are also near jumps.

Assembly emulator 8086 code#

In the far jumps, the program counter jumps to the memory location which lies outside the current code segment whereas in near jumps, the IP points to the memory address inside the current code segment and that is why the CS register remains unchanged in near jumps. There are two types of jumps namely Far and Near. It checks one or more flag conditions and transfers the control to a new memory location. On the other hand, the conditional branches are those instructions whose execution is based on some condition. For example JMP NEXT Conditional Branch Instructions