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Memory mapped IO uses a portion of RAM to handle IO requests. In this manner, instructions the CPU uses for reading and writing memory can also be used for IO, reducing the circuitry needed. This makes the CPU simpler, cheaper and more effecient.
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What are the advantages of shared momory?
Advantages of shared memory are: 1) Less disk spaceis used because the shared momory code is not included in the executable program. 2) Less momory is used b'coz the shared memory code is only loadedonce.
Advantages of using x drives?
Easy to access Doesnt take up computer memory
What is a page fault and a page swap?
a page fault is an interrupt (or exception) to the software raised by the hardware, when a program accesses a page that is mapped in address space, but not loaded in physical memory.Wikipedia knows...A page swap means that your page is loaded into main memory or is sent out of main memory to make place (probably due to memory-shortages or to make place for others).
Why are segmentation and paging sometimes combined into one scheme?
Segments can be of different lengths, so it is harder to find a place for a segment in memory than a page. With segmented virtual memory, we get the benefits of virtual memory but we still have to do dynamic storage allocation of physical memory. In order to avoid this, it is possible to combine segmentation andpaging into a two-level virtual memory system. Each segment descriptor points to page table for that segment.This give some of the advantages of paging (easy placement) with some of the advantages of segments (logical division of the program). ok hope wil b helfill
Difference between tiff and bmp image?
bmp is a bit mapped image = you save what you see ... every bit on your screen is stored into memory. tiff is Tagged Image File Format = there are codes (tags) to tell the computer how the file (image) was saved ... it uses various types of compression to shrink the image as stored in memory.
Differentiate between memory mapped IO and IO mapped IO?
Memory mapped IO is one where the processor and the IO device share the same memory location(memory) while IO mapped IO is one where the processor and the IO device have different memory located to each other.
What is the advantage and disadvantage of interrupt in memory mapped IO?
disadvantages of interrupt
What is the Difference between memory mapped IO and peripheral mapped IO?
A memory mapped IO device is an IO device that responds to a specific address when IO/M- is low. A peripheral (or IO) mapped IO device is an IO device that responds to a specific address when IO/M- is high.Many system designers ignore IO/M- in favor of memory mapped IO.This eliminates one term in the chip select logic for every device.This allows you to use all addressing modes and instructions when manipulating an IO device, as opposed to using only IN and OUT.This allows you to potentially have more than 256 different IO devices.The downside is that you reduce the addressable main memory in the system, i.e. you cannot have all 64K available to you, but this is not generally a problem in most controller designs. You also must decode 16 address lines instead of just 8 when accessing the device.
What is IO mapped?
Peripheral-Mapped IO is IO that is selected when the IO/M- line is high.
What is Peripheral-Mapped IO?
Peripheral-Mapped IO is IO that is selected when the IO/M- line is high.
What is the Difference between memory mapped IO and IO mapped IO?
In memory mapped I/O, a chunk of the CPU's address space is reserved for accessing I/O devices. In I/O mapped I/O, I/O devices are handled distinctly by the CPU and hence occupy a separate chunk of addresses predetermined by the CPU for I/O. In case of Memory mapped I/O the same address BUS is used for accessing both Memory (RAM) and the Registers of I/O devices. For I/O Mapped I/O, separate address BUS is used. As Address space is generally larger for Memory than I/O registers, the length of I/O address is larger in case of Memory Mapped I/O. For a system which uses I/O Mapped I/O, there is a requirement for a extra h/w Circuitry.
The maximum number of Io devices can be interfaced with 8085 in the Io mapped Io technique?
3
What is a memory mapped register?
A memory mapped register is a register that has its specific address stored in a known memory location.
What is the meaning of memory mapped bus?
Memory mapped buses helps in the extension of the address of the physical ram through which the devices can access the address
What are the advantages and disadvantages of borrowings?
io
Graphic images where each pixel is bit-mapped and take up more memory?
Graphic images where each pixel is bit-mapped and take up more memory?
What are the advantages and disadvantages of borrowing money?
io
