Microsoft’s Historic 6502 BASIC Code is Now Open Source

The BASIC source code was fundamental to the early era of home computing as the foundation of many of Commodore's computers.
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Rule of 72: What it is and how to use it

Here’s how the Rule of 72 works: Divide 72 by your expected annual interest rate (as a percentage, not a decimal). The answer is roughly the number of years it will take for your money to double. For ...