Inside the Machine: An Illustrated Introduction to by Jon Stokes

By Jon Stokes

Inside the Machine explains how microprocessors function -- what they do, and the way they do it. Written via the co-founder of the hugely revered Ars Technica website, the booklet starts off with the basics of computing, defining what a working laptop or computer is and utilizing analogies, a variety of 4-color diagrams, and transparent reasons to speak the strategies that shape the root of recent computing. After discussing desktops within the summary, the booklet is going directly to hide particular microprocessors, discussing intimately how they paintings and the way they fluctuate.

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By Jon Stokes

Inside the Machine explains how microprocessors function -- what they do, and the way they do it. Written via the co-founder of the hugely revered Ars Technica website, the booklet starts off with the basics of computing, defining what a working laptop or computer is and utilizing analogies, a variety of 4-color diagrams, and transparent reasons to speak the strategies that shape the root of recent computing. After discussing desktops within the summary, the booklet is going directly to hide particular microprocessors, discussing intimately how they paintings and the way they fluctuate.

Show description

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Additional info for Inside the Machine: An Illustrated Introduction to Microprocessors and Computer Architecture

Example text

Decode load #13, B in the instruction register. 6. Execute load #13, B from the instruction register, using the memoryaccess hardware. 7. Fetch the instruction beginning at #504, and load add A, B, C into the instruction register. Increment the program counter to #506. 8. Decode add A, B, C in the instruction register. 9. Execute add A, B, C from the instruction register, using the ALU and register file. 10. Fetch the instruction at #506, and load store C, #14 in the instruction register. Increment the program counter to #508.

If the branch condition evaluates to false, then the program counter is left as-is, and the next instruction in the normal program sequence is fetched on the next cycle. For example, suppose we had just subtracted the number in A from the number in B, and if the result was zero (that is, if the two numbers were equal), we want to jump to the instruction at memory address #106. Program 2-2 shows what assembler code for such a conditional branch might look like. Line Code Comments 16 sub A, B, C Subtract the number in register A from the number in register B and store the result in C.

With that in mind, you might think of a branch instruction as a similar kind of load, but under the control of the programmer instead of the CPU. The branch instruction is a load that takes the address specified by #target as its source and the instruction register as its destination. Like a regular load, a branch instruction can take as its target an address stored in a register. In other words, branch instructions can use registerrelative addressing just like regular load instructions. This capability is useful because it allows the computer to store blocks of code at arbitrary places in memory.

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