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Requires the use of a system bus, so it takes much longer.Īccessing data in a register usually takes no time. the same is for other 3 registers,īecause registers are located inside the cpu, Registers 16 bit register is also updated, and vice-versa. therefore, when you modify any of the 8 bit Like: 0011000000111001b (in binary form), or 12345 in decimal (human) form.Ĥ general purpose registers (AX, BX, CX, DX) are made of two separate 8 bitĪnd AL= 00111001b. the size of the above registers is 16 bit, it's something

The usage for each general purpose register. DX - the data register (divided into DH / DL).ĭespite the name of a register, it's the programmer who determines.CX - the count register (divided into CH / CL).BX - the base address register (divided into BH / BL).AX - the accumulator register (divided into AH / AL).RAM is a place to where the programs are loaded in order to be executed.Ĩ086 CPU has 8 general purpose registers, each register has its own name: The CPU is the heart of the computer, most of computations occur inside the CPU. The system bus (shown in yellow) connects the various components

You need to get some knowledge about computer structure It is assumed that you have some knowledge about number representation (hex/bin),Īssembly language is a low level programming language. Through this document in order to study emu8086 syntax. Programming language (java, basic, c/c++, pascal.) that may help you a lot.īut even if you are familiar with assembler, it is still a good idea to look of course if you have knowledge of some high level This tutorial is intended for those who are not familiar with assembler at all, 8086 assembler tutorial for beginners (part 1) 8086 assembler tutorial for beginners (part 1)