(8%) A virtual memory has a page size of 512 bytes, eight virtual pages, na four physical page frames. A part of the page table is as follows. What are the physical memory addresses for vistaal addresses 1048 and 20687 Virtual Page Page Frame t n main Nos in main 7.02%) A direct mapped cache consists of 32 slots. Main memory contains 128 blocks of 32 words each. Access time of the eache is 10 ns, and the time required to fill a cache slot is 200 ns. Load- through is not used. Initially, the eache is empty (1) Compute the hit ratio of a program that loops 5 times from memory locations 131 to 680. (2) Compute the average memory access time of this program. 8. (8%) A computer has 16 pages of virtual memory space but with only 3 page frames. Initially, the memory is empty. A program references the virtual pages in the order 0,7,2,7,5, 1, 5,3, 1. Please fill the following page frames with page number when each page is referenced with LRU replacement policy. Also label the references that cause a page fault. 31 PF 0 72 7 Page faults