| RICS | CISC |
|---|---|
| RICS stands for Reduced Instruction Set Computer. | CISC stands for Complex Instruction Set Computer. |
| Simple instructions taking one cycle. | Complex instructions taking multiple cycles. |
| Relatively few instructions. | Wide range of instructions. |
| Uses simple addressing modes. | Uses complex addressing modes. |
| Only LOAD/STORES reference memory. | Any instruction may reference memory. |
| Highly pipelined. | Not pipelined or less pipelined. |
| Multiple register set. | Single register set. |
| Complexity is in the compiler. | Complexity is in the micro-program. |
| Fixed format instructions. | Variable instruction formats. |
| Instructions executed by the hardware. | Instructions interpreted by the micro-program. |
| Emphasis on software. | Emphasis on hardware. |
| Examples: IBM RS6000, MC88100, DEC’s, ALPHA 21064 etc. | Examples: Intel 386, 486, Pentium, Pentium Pro, Pentium II etc. |
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