What is mov ah in assembly language?
MOV AH, 4CH means store (or “move”) the hexadecimal value 4C into register AH .
What is function of the MOV?
An MOV is a voltage dependent device which has an electrical behavior similar to back to back zener diodes. changes from a near open circuit to a very low value, thus clamping the transient voltage to a safe level. pulse is absorbed by the Varistor, thereby protecting vulnerable circuit components.
What is 21h in assembly language?
int 21h means, call the interrupt handler 0x21 which is the DOS Function dispatcher. the “mov ah,01h” is setting AH with 0x01, which is the Keyboard Input with Echo handler in the interrupt.
What is MOV al?
MOV AL,[BL+SI] ; Copy from RAM into AL. The RAM address is located at BL+SI. MOV [BL+SI],AL ; Copy from AL into RAM. It holds the start address of a data table. SI is the “source index”.
What is MOV in microprocessor?
In 8085 Instruction set, MOV is a mnemonic, which stands for “MOVe”. In this instruction 8-bit data value in register r2 will be moved to the 8-bit register r1. MOV E, H is an example instruction of this type. It is a 1-Byte instruction.
What does mov ah 4CH mean?
MOV AH, 4CH means store (or “move”) the hexadecimal value 4C into register AH . In MS-DOS, invoking interrupt 21h while AH = 4Ch causes the current process to terminate and uses the value of register AL as the exit code of the process.
What is MOV DL?
MOV DL,42. ; This copies the contents of the AX register into the BX register. ; This copies the top byte of the DX register into the top byte of the CX register. ; This copies the bottom byte of the DX register into the top byte of BX.
How does MOV work in assembly?
The mov instruction copies the data item referred to by its second operand (i.e. register contents, memory contents, or a constant value) into the location referred to by its first operand (i.e. a register or memory).