Understanding Microcomputers by Dennis Longley, Michael Shain PDF

By Dennis Longley, Michael Shain

ISBN-10: 0333375734

ISBN-13: 9780333375730

ISBN-10: 1349075531

ISBN-13: 9781349075539

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They use electromechanical devices with fast moving parts and manufacturers are under pressure to simultaneously improve the performance and reduce the costs, a dual demand that can be difficult to achieve whilst retaining a high degree of reliabilty. Disk drives and disks must be handled w ith care and a consistent policy of disk backup is essential to ensure the integrity of programs and data. A typical business user may have 20-200 floppy disks and the handling, storage and backup can prove to be a time consuming process.

The modulator circuit in the computer converts the computer output signal to the form of a TV broadcast signal and the initial stages of the TV set circuitry immediately set about reversing this process to get back to the original video signal. Some microcomputer monitors are effectively TV sets with an additional video socket that accepts the normal computer output, without the necessity of a modulator. This arrangement produces a much sharper signal, because the high frequency interference is eliminated, but w ith the screen still not designed for text displays and one should check the suitability for such a monitor for extensive text editing work.

Perform the prescribed operation . The CPU really knows nothing of the outside world, it sends out an address plus a request for data and expects the data located at that address to be sent back to it on the data bus; or it sends out an address and a request that data be accepted when it requires the data to be directed to that address. Thus a typical cycle takes the form given below: • Get the instruction located at the address given in the instruction pointer (see Fig. 2) and increment instruction pointer.

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Understanding Microcomputers by Dennis Longley, Michael Shain


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