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Real mode allows programs direct access to but protected mode does not?
John082671
i finnally freackin found it, real mode(16 bit) allows access to all hardware resources, where protected mode(32 bit) controls how the application accesses the hardware. In real-mode, an application has complete access to all hardware resources. This "open door" policy can create problems when applications make conflicting commands to the hardware. In protected mode and long mode, the OS controls how an application can access hardware.
page 53 in CompTIA A+ Guide to Managing & Maintaining Your PC, Sixth Edition by Jean Andrews
Wiki User
∙ 14y ago
Wiki User
∙ 14y agoall hardware resources
page 53 in CompTIA A+ Guide to Managing & Maintaining Your PC, Sixth Edition by Jean Andrews
Wiki User
∙ 14y agoIn real mode, an application has complete access to all hardware resources. In protected mode the OS controls how an application can access hardware.
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Serial and direct access?
direct access allows you to access the needed record directly with serial access u have to go through all the others before arriving to the desired one
File accessing techniques in data management system?
Information is kept in files. Files reside on secondary storage. When this information is to be used, it has to be accessed and brought into primary main memory. Information in files could be accessed in many ways. It is usually dependent on an application.Sequential Access: A simple access method, information in a file is accessed sequentially one record after another. To process the with record all the 1-1 records previous to 1 must be accessed. Sequential access is based on the tape model that is inherently a sequential access device. Sequential access is best suited where most of the records in a file are to be processed. For example, transaction files.Direct Access: Sometimes it is not necessary to process every record in a file. It may not be necessary to process records in the order in which they are present. Information present in a record of a file is to be accessed only if some key value in that record is known. In all such cases, direct access is used. Direct access is based on the disk that is a direct access device and allows random access of any file block. Since a file is a collection of physical blocks, any block and hence the records in that block are accessed. For example, master files. Databases are often of this type since they allow query processing that involves immediate access to large amounts of information. All reservation systems fall into this category. Not all operating systems support direct access files. Usually files are to be defined as sequential or direct at the time of creation and accessed accordingly later. Sequential access of a direct access file is possible but direct access of a sequential file is not.Indexed Sequential Access: This access method is a slight modification of the direct access method. It is in fact a combination of both the sequential access as well as direct access. The main concept is to access a file direct first and then sequentially from that point onwards. This access method involves maintaining an index. The index is a pointer to a block. To access a record in a file, a direct access of the index is made. The information obtained from this access is used to access the file. For example, the direct access to a file will give the block address and within the block the record is accessed sequentially. Sometimes indexes may be big. So hierarchies of indexes are built in which one direct access of an index leads to info to access another index directly and so on till the actual file is accessed sequentially for the particular record. The main advantage in this type of access is that both direct and sequential access of files is possible.
Difference between direct and serial access?
Serial access means going through everything one by one, starting at the beginning, until you reach the item you want. Direct access means going straight to the item you want without having to go through other ones. If you wanted to print all the names in a database, using serial access would be fine because you are starting at the first and going right through to the end.In terms of storage units, magnetic tape is a form of serial access, where a disk provides direct access. If you think of a cassette tape, you would have to fast forward or rewind to get to a piece of music you wanted. A CD enables you to go direct to what you want, without having to pass through anything else.
What are types of secondary memory?
two
Is direct access file ordered?
A direct access file, in most systems, refers to a file where individual records are retrieved directlly by using a record number to refer to a specific position in a file. The alternative is to reach the desired record by sequential access: Reading all the records from the beginning until you reach the desired position in the file. The records in the file do not have to be in any specific order.
Real mode allows programs direct access to?
Hardware
What resource is allows a hardware device to directly access RAM?
direct memory access (DMA)
Serial and direct access?
direct access allows you to access the needed record directly with serial access u have to go through all the others before arriving to the desired one
Which type of data access allows access to any piece of data in the file without reading the data that comes before it?
Direct access. AS
Which type of data file access allows access to any piece of data in the file without reading the data that comes before it?
Direct access. AS
Types of storage device?
Summary of secondary storage media. Floppy disk, direct access and removeable.Use Slow Sequential Access Hard disk, high capacity and fastest direct access. Use Store Programs and Data CD-ROM High capacity and removable direct access. Use Entertainment Software, Reference Material Magnetic Tape, High capacity and inexpensive.Use Back-up Programs and Data.
Where can one get direct access to the internet?
One can get direct access to the internet almost anywhere. It is a method of connecting similar to VPN connectivity that allows one to remote access a series of computers on a intranet server. It was first used as part of Windows Server 2008.
How can one access general insurance?
Access General Insurance can be found online at their website Access or one can speak direct to an agent. It primarily deals with auto injury and property insurance programs.
What allows a device to send data directly to memory by passing the CPU?
It's called DMA (Direct Memory Access)
Differentiate between Direct Access and Sequential Access methods?
the difference between them is that direct access, such as a DVD allows you to go directly to a specific piece of data using an index, whereas sequential access is when data is chronologically stored on a VCR tape or Magnetic tape, you must go through all the data before you reach the data your looking for.
What are the techniques of file processing?
The common techniques of file processing include sequential access, random access, and direct access. Sequential access involves reading data sequentially from the beginning to the end of a file. Random access allows reading data from any part of the file without having to read the preceding data. Direct access uses a key or address to locate specific data within the file.
What are the benefits of weather direct?
Weather Direct is a system that you can install in your home that allows direct access to weather information without having to go online or turn on your TV. This would be helpful in the event of a power outage or server problems getting on the web.
