1. Discuss some situations wherein a sequential access storage device such as a tape could be a useful form of mass storage.2. Assume that we are receiving a message across a network using a modem with a rate of 56000 bits/second. fur thermoses assume that we are working on a workstation with an instruction rate of 500 MIPS. How many instructions can the processor execute between the receipts of each individual bit of the message?3. Consider the following structure of the instruction register.op code address-1address-2 6 bits 18 bits18 bitsa. What is the maximum number of distinct operation codes that can be recognized and executed by the processor on this machine?b. What is the maximum memory size on this machine?c. How many bytes are required for each operation?