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Why is it desirable to load device drivers into upper memory rather tnan conventional memory?
Most DOS applications utilize conventional memory. Many DOS applications can not utilize extended or expanded memory without special software. When you load device drivers into upper memory, you leave more conventional memory free for other applications to use.
What is Memory management in ms dos?
MS-DOS does not have built-in memory management.
Are MS DOS programs loaded in the main memory?
yes. of course. MS-DOS does not have a dynamic memory management.
What is conventional memory in PC?
Conventional memory refers to the memory reserved to run DOS programs in a computer system. DOS only uses the first 640 kb of memory in a PC.
How much memory is found in DOS transient program area?
1. How much memory is found in the DOS transient program area
What does EMS refer to?
expanded memory
Difference between expanded and extended memory?
Extended memory Memory addresses greater than or equal to one megabyte are called extended memory. The 8088 and 8086 PCs can't have extended memory because these chips can access only addresses of less than one megabyte (1MB) in size. With the minor exception of the High Memory Area (HMA), extended memory can be addressed only by applications run in real mode. It is possible, however, for DOS applications to make use of this memory to store data (but not to execute code directly from there). XMS (eXtended Memory Standard, promulgated by Microsoft) permits applications to allocate extended memory and takes care of copying data to and from extended memory and conventional memory so that the application does not have to worry about switching between modes. Like EMS, XMS usually requires loading a device driver of some sort. Extended memory is limited to 15Mb on 286es and 386SXes (15Mb extended plus 1Mb conventional and upper memory equals 16Mb, or 224, 24 being the number of address lines coming out of the CPU), limited to 4 gigabytes (232) for 386DX chips and up, although very few motherboards have been designed to hold that much memory. Expanded memory Expanded memory is addressed from within the lower 1MB space, usually above 640K. It is sometimes up to 64K of real addresses but this is just a small portion of the whole expanded memory, which can be very large. The expanded memory requires hardware and/or software that maps the expanded memory to a piece of address space, in what is called a "page frame". Extended memory can be used as expanded memory by using software and the 80286 or 80386 chips to "remap" it to the lower 1MB. It should be noted that the 80386 chip has hardware built in that supports expanded memory while the 80286 chip does not. Software that will convert extended memory on an 80286 machine to expanded memory may result in a significant performance penalty, if the machine does not have special hardware support for expanded memory. Software that will convert extended memory to expanded memory on an 80286 machine is not written to use the special hardware built into the 80386 chip, so the same type of performance penalty may apply. Hardware supported expanded memory is the fastest form of expanded memory and is available directly on all 80386SX or better IBM compatibles running the proper software. It is also available on some 80286 machines with special chip sets or 80286 machines equipped with a hardware memory manager add-on. Lastly, it is available in a large number of memory expansion boards for all IBM compatible machines, including the 8088/8086 machines
What do DOS stands for?
read only memory
Using the DOS memory model the first 640K of memory is known as what?
SEMI
What dos rom stands for?
read only memory
What is Expandable memory?
The expanded memory is a process for expanding and providing additional memory to the disk operating system or (DOS) beyond the limit of conventional memory which is 640KB. Its latest version was developed in the year 1987.
What is the expanded form of RAM?
Random Access Memory.
