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Registers
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The Man in the Box provides good insight into the workspace inside a CPU The EDB gives you a way to communicate with the Man in the Box so you can give him work to do But to do this work, he needs a worktable; in fact, he needs at least four worktables Each of these four worktables has 16 light bulbs These light bulbs are not in pairs; they re just 16 light bulbs lined up straight across the table Each light bulb is controlled by a single switch, operated only by the Man in the Box By creating on/off patterns like the ones on the EDB, the Man in the Box can work math problems using these four sets of light bulbs In a real computer, these worktables are called registers (Figure 36) Here 1 means on; 0 means off
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The 8088 was the first CPU to use the four now famous AX DX general-purpose registers, but they still exist in even the latest CPUs (But they ve got a lot more light bulbs!)
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The four general-purpose registers
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Registers provide the Man in the Box with a workplace for the problems you give him All CPUs contain a large number of registers, but for the moment let s concentrate on the four most commonly used ones: the generalpurpose registers Intel gave them the names AX, BX, CX, and DX Great! We re just about ready to put the Man in the Box to work, but before you close the lid on the box, you must give the Man one more tool Remember the codebook we mentioned earlier Let s make one to enable us to communicate with him Figure 37 shows the codebook we ll use We ll give one copy to him and make a second for us
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Figure 37
CPU codebook
3: Microprocessors
In this codebook, for example, 10000111 means Move the number 7 into the AX register These commands are called the microprocessor s machine language The commands listed in the figure are not actual commands as you ve probably guessed, I ve simplified dramatically The Intel 8088 CPU, invented in the late 1970s, actually used commands very similar to these, plus a few hundred others Here are some examples of real machine language for the Intel 8088:
10111010 01000001 00111100 The next line of code is a number Put that number into the DX register Add 1 to the number already in the CX register Compare the value in the AX register with the next line of code
By placing machine language commands called lines of code onto the external data bus one at a time, you can instruct the Man in the Box to do specific tasks All of the machine language commands that the CPU understands make up the CPU s instruction set So here is the CPU so far: the Man in the Box can communicate with the outside world via the external data bus; he has four registers he can use to work on the problems you give him; and he has a codebook the instruction set so he can understand the different patterns (machine language commands) on the external data bus (Figure 38)
Clock
Okay, so you re ready to put the Man in the Box to work You can send the first command by lighting up wires on the EDB How does he know when you re done setting up the wires and it s time to act Have you ever seen one of those old-time manual calculators with the big crank on one side To add two numbers, you pressed a number key, the + key, and another number key, but then to make the calculator do the calculation and give you the answer, you had to pull down the crank That was the signal that you were done entering data and instructions and ready for the calculator to give you an answer Well, a CPU also has a type of crank To return to the Man in the Box, imagine there s a buzzer inside the box activated by a button on the outside of the box Each time you press the button to sound the buzzer, the Man in the Box reads the next set of lights on the external data bus Of course, a real computer doesn t use a buzzer The buzzer on a real CPU is a special wire called the clock wire (most diagrams label the clock wire CLK) A charge on the CLK wire tells the CPU there s another piece of information waiting to be processed (Figure 39)
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