March 2018
Beginner
744 pages
26h 5m
English
Content preview from Essentials of Computer Organization and Architecture, 5th Edition
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4.12 EXTENDING OUR INSTRUCTION SET
Even though MARIE’s instruction set is sufficient to write any program we wish, there are a few instructions we can add to make programming much simpler. We have 4 bits allocated to the opcode, which implies that we can have 16 unique instructions, and we are using only 9 of them. Surely, we can make many programming tasks much easier by adding a few well-chosen instructions to our instruction set. Our new instructions are summarized in Table 4.6.
TABLE 4.6 MARIE’s Extended Instruction Set
| Instruction Number (hex) | Instruction | Meaning |
| 0 | JnS X | Store the PC at address X and jump to X + 1. |
| A | Clear | Put all zeros in AC. |
| B | AddI X | Add indirect: Go to address X. Use the value at X as the actual ... |
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