然后再将寄存器127用作循环计数器，将寄存器126用作基指针，并在每个值上执行convert _ to_upper，直到到达缓冲区的底部为止。
You then use register 127 as your loop counter and register 126 as your base pointer, and perform convert_to_upper on each value until you get to the end of the buffer.
内存中的一块留用存储区，当程序中断产生时，CPU自动在其中保存程序计数器和工作寄存器的内容。
A reserved area of memory where the CPU automatically saves the program counter and the contents of working registers when a program interrupt occurs.
包含下一条要执行指令地址的处理器中的寄存器。也叫程序计数器。
A register in the processor that contains the address of the next instruction to be executed. Also known as a program counter.
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