虽然 PDP-15 支持各种操作系统，但是此机器的有趣用法与公式计算器 (FOCAL) 语言一起使用。

Although the PDP-15 supported a variety of operating systems, one interesting use of this machine is with the formula calculator (FOCAL) language.

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本文详细介绍了岩层真厚度计算公式，在袖珍计算器中进行计算程序编排的方法。

This paper introduces in detail the formula for calculating the true thickness of strata and the method for the programming of the calculation by use of the pocket calculator.

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运用此公式，再通过栅格计算器即可得到真实的累积时间成本栅格图，基本单位为分钟。

Using this formula, then obtains the real cumulative time cost grid chart again through the grid calculator, Fundamental unit for minute.

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