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26 January, 17:30

We wish to execute a single LC-3 instruction that will subtract the decimal number 25 from register 1 and put the result in register 2. Can we do it, if yes, show how it would be done, if not, explain why not

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  1. 26 January, 19:46
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    No

    Explanation:

    Brief introduction to lc-3

    The LC-3 defines a word size of 16 bits for its registers. It also utilizes a 16 bit addressable memory with 216 location address space. The register file has 8 registers (R0 - R7), and all its registers are referred to as general-purpose registers because they can be freely used by any of the instructions that is enabled to write to the register file.

    No, it is not possible to use a single LC-3 instruction to implement the subtraction operation, because we only have a 5-bit 2's complement immediate value which can only be used to represent values between - 16 and 15
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