第一个操作数是目标寄存器,第二个操作数是要加载的D - Form地址。
"The first operand is the destination register and the second is the D-Form address to load."
这是因为调用或跳转语句的机器码操作数是相对地址。
This is because a call or jump statement's machine code operand is a relative address.
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.
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