I rate best....................... Your task is to consider the successor to the

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I rate best.......................

Your task is to consider the successor to the LC-3. We will add 16 additional instructions to the ISA and expand the register set from 8 to 16. We would like our machine to have addressability of 1 byte and a total memory size of 64K bytes. We will keep the size of an instruction at 16 bits. Also, we will encode all new instructions with the same five fields as the original 16 instructions, although it may be necessary to change the size of some of those fields. What is the largest immediate value that can be represented in an arithmetic instruction? If we want 128 different operating system routines to be able to be accessed with a trap instruction and we form the address of each of these routines by shifting the trap vector to the left by 5 bits, what is the minimum amount of memory required by the trap service routines? If, in the new version of the LC-3, we reduced the number of registers from eight to four and kept the number of encodes at 16, what is the largest immediate value we could represent in an ADD instruction on this new machine?

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