#INSTRUCCION MOV DEL EMU8086 64 BITS#
#INSTRUCCION MOV DEL EMU8086 CODE#

8086 Errata Interrupts Following MOV SS,xxx and POP SS Instructions May Corrupt Memory We do not have any official Intel documentation of 8086/8088 errata, but the following are well-known вЂњfeaturesвЂќ The dividend 8 is stored in the 16-bit AX register and the divisor 2 is stored in the 8-bit BL register.Home of the original IBM PC emulator for browsers. After division, the 32-bit quotient goes to the EAX register and the 32-bit remainder goes to the EDX register. The high-order 32 bits are in EDX and the low-order 32 bits are in EAX.

#INSTRUCCION MOV DEL EMU8086 64 BITS#

The dividend is assumed to be 64 bits long and in the EDX:EAX registers. After division, the 16-bit quotient goes to the AX register and the 16-bit remainder goes to the DX register. The high-order 16 bits are in DX and the low-order 16 bits are in AX. The dividend is assumed to be 32 bits long and in the DX:AX registers. After division, the quotient goes to the AL register and the remainder goes to the AH register. The dividend is assumed to be in the AX register (16 bits). Following section explains three cases of division with different operand size в€’ Sr.No. The operation affects all six status flags. Both the instructions can work with 8-bit, 16-bit or 32-bit operands. The format for the DIV/IDIV instruction в€’ The DIV (Divide) instruction is used for unsigned data and the IDIV (Integer Divide) is used for signed data. The processor generates an interrupt if overflow occurs.

However, in case of division, overflow may occur. In case of multiplication, overflow does not occur because double-length registers are used to keep the product. The division operation generates two elements - a quotient and a remainder. The following example multiplies 3 with 2, and displays the result в€’ The product generated is stored in the EDX:EAX registers, i.e., the high order 32 bits gets stored in the EDX register and the low order 32-bits are stored in the EAX register. When two doubleword values are multiplied, the multiplicand should be in EAX and the multiplier is a doubleword value stored in memory or in another register. When two doubleword values are multiplied в€’ The high-order (leftmost) portion gets stored in DX and the lower-order (rightmost) portion gets stored in AX. The resultant product is a doubleword, which will need two registers. For example, for an instruction like MUL DX, you must store the multiplier in DX and the multiplicand in AX. The multiplicand should be in the AX register, and the multiplier is a word in memory or another register. When two one-word values are multiplied в€’ High-order 8 bits of the product is stored in AH and the low-order 8 bits are stored in AL. The multiplicand is in the AL register, and the multiplier is a byte in the memory or in another register. Following section explains MUL instructions with three different cases в€’ Sr.No. Multiplicand in both cases will be in an accumulator, depending upon the size of the multiplicand and the multiplier and the generated product is also stored in two registers depending upon the size of the operands. The syntax for the MUL/IMUL instructions is as follows в€’ Both instructions affect the Carry and Overflow flag. The MUL (Multiply) instruction handles unsigned data and the IMUL (Integer Multiply) handles signed data. There are two instructions for multiplying binary data.

#INSTRUCCION MOV DEL EMU8086 CODE#

When the above code is compiled and executed, it produces the following result в€’ add '0' to to convert the sum from decimal to ASCII and subtracting ascii '0' to convert it into a decimal number moving the first number to eax register and second number to ebx Global _start must be declared for using gcc Msg2 db 'Please enter a second digit', 0xA,0xD The following example will ask two digits from the user, store the digits in the EAX and EBX register, respectively, add the values, store the result in a memory location ' res' and finally display the result.

An ADD or SUB operation sets or clears the overflow and carry flags. However, like other instructions, memory-to-memory operations are not possible using ADD/SUB instructions. The ADD/SUB instruction can take place between в€’ The ADD and SUB instructions have the following syntax в€’ The ADD and SUB instructions are used for performing simple addition/subtraction of binary data in byte, word and doubleword size, i.e., for adding or subtracting 8-bit, 16-bit or 32-bit operands, respectively. The DEC instruction has the following syntax в€’ It works on a single operand that can be either in a register or in memory. The DEC instruction is used for decrementing an operand by one. The operand destination could be an 8-bit, 16-bit or 32-bit operand. The INC instruction has the following syntax в€’ The INC instruction is used for incrementing an operand by one.

Instruccion mov del emu8086