I was pulling out old boxes and came across the following: LSI L64815 Memory Management, Cache Ctr., and Cache Tag Unit Technical Manual. It has all the bits and info. that one would need to program the Sun4m MMU arch. It even has documentation on block fill/copy instructions. Quite a gem of a book.. LSI Logic 405-433-8000 part no. MS71-000107-99B -brad w.