3 Based on the C51 way of multi-machine communication host source with cumulative checksum

主机
....\STARTUP.A51
....\STARTUP.LST
....\STARTUP.OBJ
....\zhu
....\zhu.c
....\zhu.hex
....\zhu.lnp
....\zhu.LST
....\zhu.M51
....\zhu.OBJ
....\zhu.Opt
....\zhu.plg
....\zhu.Uv2
....\zhu_Opt.Bak
....\zhu_Uv2.Bak

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