tailieunhanh - A complete illustrated Guide to the PC Hardware phần 6

"nơi mà tôi đã được nhấn mạnh nhiều vào các tùy chọn này. Nhưng khác rất nhiều các chương trình Windows khác không cung cấp các tùy chọn . những vĩ mô. Đó là trường hợp với một chương trình như Composer, mà tôi sử dụng để viết các trang nhà của tôi. | An illustrated Guide to CPUs from 8086 to Pentium-III Data have a path to the CPU. It is kind of a data expressway called the system bus. You can read more about the system bus in module 2b. Two types of data top The CPU is fed long streams of data via the system bus. The CPU receives at least two types of data Instructions on how to handle the other data. Data which must be handled according to the instructions. What we call instructions is program code. That includes those messages which you continuously send to the PC from the mouse and keyboard. Messages to print save open etc. Data are typically user data. Think about the letter which you are writing to Aunt Karen. The contents letters images etc. are user data. But if you click print you are then sending program code instructions http hardware 2 of 5 7 27 2004 4 07 52 AM An illustrated Guide to CPUs from 8086 to Pentium-III 8086 compatible instructions top The biggest job for the CPU consists of decoding the instructions and localizing data. The calculations themselves are not heavy work. The decoding consists of understanding the instructions which the user program sends to the CPU. All PC CPUs are 8086 compatible. This means that the programs communicate with the CPU in a specific family of instructions. These instructions originally written for the Intel 8086 processor became the blueprint for the IBM compatible PC concept. The 8086 from 1978 received its instructions in a certain format. Since there was a desire that subsequent CPU generation should be able to handle the same instructions which the 8086 could it was necessary to make the instruction sets compatible. The new CPUs should understand the same instructions. This backwards compatibility has been an industry standard ever since. All new processors regardless of how advanced must be able to handle the 8086 instruction format. Thus the new CPUs must use much effort to translate the 8086 instruction format to .