Internally, a debugger has direct access to the same memory space as the running process, while an external debugger will access the memory via a socket.
内部调试器对运行进程所在的内存空间具有直接访问权，而外部调试器将通过套接字访问内存。
Port 0 is also the multiplexed low-order address and data bus during access to external program and data memory.
端口0也是复低位地址和在利用外部程序和数据存储器的数据总线。
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