USB test code, use P89c52x2 to develop a USB node

DP-51+_USB
..........\Chap_9.c
..........\CHAP_9.H
..........\Chap_9.LST
..........\Chap_9.OBJ
..........\D12ci.c
..........\D12CI.H
..........\D12ci.LST
..........\D12ci.OBJ
..........\Epphal.c
..........\EPPHAL.H
..........\Epphal.LST
..........\Epphal.OBJ
..........\Isr.c
..........\Isr.LST
..........\Isr.OBJ
..........\key_s.h
..........\Mainloop.c
..........\MAINLOOP.H
..........\Mainloop.LST
..........\Mainloop.OBJ
..........\Protodma.c
..........\PROTODMA.H
..........\Protodma.LST
..........\Protodma.OBJ
..........\USB
..........\USB.asm
..........\USB.cfg
..........\USB.hex
..........\USB.M51
..........\USB.mpj
..........\USB.Opt
..........\USB.plg
..........\USB.Uv2
..........\USB100.H
..........\USB_Opt.Bak
..........\USB_Uv2.Bak

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