# What is a memory address range?

## What is a memory address range?

Memory locations are enumerated in hexadecimal, so the first segment includes the addresses 00000h through 0FFFFh (0 through 65,535 decimal) and the 16th includes the addresses F0000h through FFFFFh (983,040 through 1,048,575 decimal). …

What is memory address and its purpose?

A memory address is a unique identifier used by a device or CPU for data tracking. This binary address is defined by an ordered and finite sequence allowing the CPU to track the location of each memory byte. Before CPU processing, data and programs must be stored in unique memory address locations.

The actual memory address is calculated by adding a zero to the right of the segment address and adding the offset value, like this: C800:5 = C8000 + 5 = C8005. There are 655,360 memory addresses in conventional memory, where each mem- ory address can hold 1 byte, or 8 bits, of either data or program instructions.

### What is the difference between RAM and ROM?

RAM, which stands for random access memory, and ROM, which stands for read-only memory, are both present in your computer. RAM is volatile memory that temporarily stores the files you are working on. ROM is non-volatile memory that permanently stores instructions for your computer.

What is the address range of 16 KB memory?

When each register is 16 bit , the number of combinations of 1 and 0 it can hold is (2) ^ (16). Hence the memory range is (2) ^ 16 bits = (2) ^ 13 bytes = 8192 bytes ,approximately 8 kilobytes .

What is the difference between memory location and address?

Memory addresses are fixed-length sequences of digits conventionally displayed and manipulated as unsigned integers. Memory location in a stored-program computer holds a binary number or decimal number of some sort.

#### What is the function of MAR?

MAR holds the memory location of data that needs to be accessed. When reading from memory, data addressed by MAR is fed into the MDR (memory data register) and then used by the CPU. When writing to memory, the CPU writes data from MDR to the memory location whose address is stored in MAR.

How do you calculate memory bytes?

Bits vs. Bytes – A byte is simply 8 bits of memory or storage. This is the smallest amount of memory that standard computer processors can manipulate in a single operation. If you determine the number of bits of memory that are required, and divide by 8, you will get the number of bytes of memory that are required.

How is 216 64KB?

One address addresses one something. So 16 bits of address can address 216 somethings. In the case of memory organised in bytes, this is 64KB (kilobytes). If memory were organised in bits, this would be 64Kb (kilobits).

## What is a 16-bit address bus?

Microprocessor and Memory Basics In many older computers, the address bus was 16 bits wide (a = 16). This meant that there were 16 wires. Such microprocessors could address up to 216 = 65536 memory locations. By increasing the width of the address bus, more memory locations can be directly addressed.

How to calculate a memory address?

FPM/EDO/SDRAM – burst =1 so word size is 16b

• DDR min burst =2 so word size is 32b
• DDR2 min burst =4 so word size is 64b
• DDR3/4 min burst =8 so word size is 128b.
• What is the highest memory address?

– initialized data ( data segment ); – uninitialized (but allocated) variables; – run-time stack; – heap; – shared memory and memory mapped files.

### How to get memory address?

Memory Address. In the example from the previous page, the & operator was used to create a reference variable. But it can also be used to get the memory address of a variable; which is the location of where the variable is stored on the computer. When a variable is created in C++, a memory address is assigned to the variable.

How many bytes in a memory address?

an address. The word address is simply the address of the first byte of the word. If we imagine a 64 byte memory with 32 bit (4 byte) words, then there are 64/4 = 16 words in this storage. Notice that to address a byte in this storage we need 6 bits in the address register (26=64 bytes) but to address a word we only need 4 bits (24=16 words). The