I got confused by this, because usually with direct mapping we already know the first 3 are going to be misses because they're not in the cache yet. Inorder to find where a number goes, we do mod 3 since thats the size of the cache. So if we do 2 mod 3 we got 2, so it gets placed in the second position. Now if we do 8 mod 3 that also has to get placed in the second position. I just got confused on how i would write it since we already have to replace something and we haven't even wrote the first 3 numbers which are all supposed to be misses.

Q. Assume a system with direct mapped cache of size 3, initially empty. Complete cache mapping chart for each memory access, and provide total memory access time, if main memory access time is 28ns and cache access time is 3ns (penalty time =1ns ) (26 points)