A problem of register machines and computibility. "Initially, registers A and B contain x and y stones, respectively, with all other registers empty. Program the machine to leave x-y stones in register A unless that's a negative number, in which case it's to leave 0 stones there." Using register machine diagrams.

Systems Architecture
7th Edition
ISBN:9781305080195
Author:Stephen D. Burd
Publisher:Stephen D. Burd
Chapter4: Processor Technology And Architecture
Section: Chapter Questions
Problem 2PE: If a microprocessor has a cycle time of 0.5 nanoseconds, what’s the processor clock rate? If the...
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A problem of register machines and computibility. "Initially, registers A and B contain x and y stones, respectively, with all other registers empty. Program the machine to leave x-y stones in register A unless that's a negative number, in which case it's to leave 0 stones there." Using register machine diagrams. 

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