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As the name implies, it takes the data from the source and copies it to the destination operand. The LEA stands for load Effective address. If you want to use port address over 255, then store this port address to DX and then execute OUT instruction MOV DX, 456DH The syntax of this instruction is: OUT Port Address, Register The OUT instruction outputs the data of register on to a port specified in the instruction. If you want to access a port number over 255 then first load the port address into DX and then use IN instruction.
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The range of port addresses is from 000H to FFFFH. The syntax of IN instruction is: IN Reg, Port Address Thus, data transfer takes place between register and I/O device. The IN instruction takes the input from the port and transfers that data into the register. These two instructions are supported by 8086 microprocessor to take directly transfer data between GPIO ports. MOV AH,02H Displays the charachter stored in DL XLAT Sets AL to the hexa decimal value of var a MOV BX,OFFSET TABLE Sets BX to offset of starting address of the table Now, consider an example which takes a variable a in a range 1 to 15 and display it as a hexadecimal digit. The syntax for this instruction is: XLATįirst, you’ll have to store the starting offset address of table into BX register which is done by: MOV BX, OFFSET Table_Name The XLAT instruction takes the byte number from AL and load the contents of address DS: BX+AL into AL register. The BX register contains the offset address of the lookup table. Just like MOV instruction, the XCHG instruction does not modify the contents of flag register. The final output becomes: AX 3D05 CX 5C21 AH 21 CH 5C AL 05 CL 3D Then XCHG AH, CL exchanges the most significant bits of AH with lower bits of CL. AX 5C21 CX 3D05 AH 5C CH 3D AL 21 CL 05Īfter execution of fourth instruction XCHG AX, CX, the contents of AX and CX are exchanged.
Move trainz simulator 12 data folder code#
The code given above first sets AX to 5C21 and CX to 3D05. XCHG CL, 25 exchanges bytes of CL with bytes stored in memory location DS:25+BX. The syntax of instructions is: XCHG Destination, Source
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Both operands should be a general-purpose register. The direct exchange of data between memory locations is illegal. Both operands should be of the same type either word (16 bits) or a byte (8 bits). The XCHG instruction exchanges the contents of the source and destination. POP Load the value from location of SP to memory address DS:0012H POP CX Load the last value stored at stack into CX which is BX The POP instruction does not support CS as a destination operation. The destination operand can be a general-purpose register, segment register, or memory address. The format for this instruction is: POP destination The POP instruction loads the word from the stack pointed by SP and then increments the SP by 2. MOV DL, +6 Load data from PA=DS(Shifted left)+BX+6 to DL Copy data from AX to physical address(PA) MOV, 6Ah Sets memory address 02712:0069 to 6Ah MOV SI, 25 Set SI to 0019 (decimal value of 25) DB is used for storing byte and DW is used for storing a word (2 bytes). In the code given below, a and b are the variables. Example Assembly CodeĬonsider an example to understand the behavior of MOV instruction. The MOV instruction does not affect any value in the flag register. Therefore, both source and destination operands cannot be memory address. It is not possible to transfer data directly from one memory location to another. The 8086 MOV instruction supports the following operands: Source Destination Example Reg Reg MOV AX, BL Memory Address Reg MOV CX, Reg Memory Address MOV, AH Immediate Reg MOV AL, 21C Immediate Memory Address MOV, 37B2 Segment Register Reg MOV AX, DS Reg Segment Register MOV CS, CX The destination operand can be any register or a memory location whereas the source operand can be a register, memory address, or a constant/immediate. The syntax of this instruction is: MOV Destination, Source Both operands should be of same type either byte or a word. The MOV instruction copies a byte or a word from source to destination.
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