如果累加器内容是负数，分支到操作数指定的地址。
JPN Branch to the address specified by the operand if the contents of the accumulator are negative.
现在让我们看一下如何将个别寄存器作为操作数的约束指定。
Now let's take a look at how to specify individual registers as constraints for the operands.
它将第二个操作数内的寄存器与第三个操作数内的常量加在一起，并将结果存储在第一个操作数内指定的寄存器中。
It adds together the register in the second operand with the constant in the third operand, and stores the result in the register specified in the first operand.
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