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m-：从存储器内容中减去当前显示值，是计算结果并用已储存的数字减去目前的结果； mr：按下此键将调用存储器内容, MC：按下时清除m存储器内容 GT：按下GT键,传送GT存储寄存器内容到显示寄存器;按AC或C键消除GT显示标志.

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kb（即k）、mb（即m）、gb等都是基于字节换算的存储单位。三者的换算为1kb=1024b，1mb=1024kb，1gb=1024mb。 在计算机内部，信息是釆用二进制的形式进行存储、运算、处理和传输的。因为电脑内部电路工作有高电平和低电平两种状态，二进制表示信号以便计。

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