ok so im taking an operating systems class and i have hw to do, and i can not figure a few problems out for the life of me, id love some help if any1 has any ideas for these problems
5. One reason GUI’s were initially slow to be adopted was the cost of the hardware needed to support them. How much video RAM is needed to support a 25 line X 80 row character monochrome text screen? How much for a 1024 X 768 pixel 24-bit color bitmap? What was the cost of this RAM at 1980 prices ($5/KB)? How much is it now?
and second question being
10. Consider a computer system that has cache memory, main memory (RAM) and disk, and the operating system uses virtual memory. It takes 2 nsec to access a word from the cache, 10 nsec to access a word from the RAM, and 10 ms to access a word from the disk. If the cache hit rate is 95% and main memory hit rate (after a cache miss) is 99%, what is the average time to access a word?
5. One reason GUI’s were initially slow to be adopted was the cost of the hardware needed to support them. How much video RAM is needed to support a 25 line X 80 row character monochrome text screen? How much for a 1024 X 768 pixel 24-bit color bitmap? What was the cost of this RAM at 1980 prices ($5/KB)? How much is it now?
and second question being
10. Consider a computer system that has cache memory, main memory (RAM) and disk, and the operating system uses virtual memory. It takes 2 nsec to access a word from the cache, 10 nsec to access a word from the RAM, and 10 ms to access a word from the disk. If the cache hit rate is 95% and main memory hit rate (after a cache miss) is 99%, what is the average time to access a word?
