a. We wish to execute a single LC-3 instruction that will subtract the decimal number 20 from register 1 and put the result into register 2. Can we do it? If yes, do it. If not, explain why not.
b. After executing the following LC-3 instruction: ADD R2, R0, Rl, we notice that R0[15] equals Rl[15], but is different from R2[15]. We are told that R0 and Rl contain UNSIGNED integers (that is, nonnegative integers between 0 and 65,535). Under what conditions can we trust the result in R2?
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