\#1-a) Convert 685(10)Binary(2)Octal(8)Hex(16) b) Draw a 64X1 Mux given 8X1 Muxes and 2X1 Muxes c) Draw a decoder with 8 input lines. \#2-a) Given Cache access time of 10ns, main memory of 100ns And a hit ratio of 99% Find Effective Access Time(EAT). b) Convert from infix to reverse polish notation: (AB)A(BD+CE) c) Convery from reverse polish notation to infix ABCD+ \#3 Given Figure 6.29 "Pentium Memory hierarchy" in the text, describe each part.| \#4 Suppose that a 8MX32 main memory is built using 128KX8RAM chips and memory is word addressable. a) How many RAM chips are necessary? b) Accessing one full word, how many chip would be involved c) Number of address bits for each RAM chip? d) Number of Banks? e) How many address bits to needed for all memory? f) How many lines must be decoded for the chip select input? Specify size of the decoder