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What are the memory addresses from 0 to 640kb known as?
The memory addresses from 0 to 640 KB are known as conventional memory. This range was primarily used in early personal computers, specifically in the context of the x86 architecture. It was the area of RAM available for use by MS-DOS and older operating systems, where most applications and programs would operate. Beyond this range, from 640 KB to 1 MB, is known as upper memory.
Why is the conventional has logical memory allocation of 0 to 640 KB?
The original 1981 IBM PC used an Intel 8088 CPU which had an address space of 1 megabyte. The lower 640KB of the address space (a huge amount for the day) was dedicated to RAM and the rest was dedicated to ROM and graphics memory. The ROM contained BIOS for booting and simple device drivers, and a BASIC interpreter. Intel x86 CPUs from the 286 onward have had much larger address spaces, but for backward compatibility they all have hardware modes where they can pretend to be an 8086, with its 1MB limitation.
How many address lines can access a 16MB memory?
for 16 MB memory has 24 address lines
What are array of string pointers?
An array of pointers to string would contain, per array position, a number dictating which memory address holds the string data. For example, position [0] in an array would contain a memory address. This memory address can be de-referenced to obtain the actual information held within that memory address.
What is the first test Test 0 performed by memtest86?
Test 0 [Address test, walking ones, no cache]Tests all address bits in all memory banks by using a walking ones address pattern.
What is offset address?
An offset address is a relative address rather than an absolute address. You use offsets to refer to memory relative to an absolute address. For instance, array indices are implemented using offsets from the start address of the array, such that element 0 is at offset 0 and element 5 is at offset 5.
What would be the hexadecimal representation of the largest memory address in a memory consisting of 4MB if each cell had a one-byte capacity?
If the architecture allows each individual byte to be adressed then there are 4,000,000 possible addresses ranging from 0 to 3,999,999. So the largest address is 3,999,999 which is 3D08FF in hexadecimal representation
What Debug command dumps data at the beginning of the memory address space?
In my debugger it is%D V'0'your debugger may use other commands.
What is defference between direct and indirect address?
The I bit is 0 so the instruction is recognice as a direct address instruction The indirect address instruction needs 2 referance to memory to fetch & opened The I bit is 1 so the instruction is recognice as a indirect address instructionhe
Write a program to find out the address of an element in an array?
== Java does not allow reference to memory locations. == In C: for (i=0; i<n; ++i) printf ("a[%d] is at %p\n", i, &a[i]);
What is universal pointers?
A universal pointer is a pointer variable that does not specify the type being pointed at. That is, it can be used to store any memory address regardless of the type of object actually stored at that address. It can be likened to a variable type, but you cannot dereference the memory address without providing some mechanism for determining the actual type stored at that memory address. Generally you would use a universal pointer when you don't actually care what type resides at the address, you are only interested in the address itself. But just as a typed pointer can point to 0 (or NULL), so can a universal pointer, which simply means it points at nothing at all.
How the page faults are handled by an operating system?
We are have a two dimensional array, A: array[0..199,0..199] of characters. The contents of the array are stored in memory in row-major order starting at memory address 200. (i.e. A[0,0] is at address 200, A[0,1] is at address 201, ... A[0,99] is at address 299, A[1,0] is at address 300, etc.). In our computer each page of memory consists of 400 bytes (1 character takes up 1 byte), and there are three physical frames available to a process, one of which is taken up by the code segment currently being run. Assuming only the code segment page is initially loaded into memory, and an LRU page replacement algorithm is being used, determines how many page faults are caused by the array accesses in the following two code segments: // Code Segment A: for(j=0;j
