USB keyboard instance, the source copy to a directory and open the appropriate build environment.

usbkeyboard\hid_kb\dscr.a51
...........\......\dscr.LST
...........\......\dscr.OBJ
...........\......\EZUSB.LIB
...........\......\fw.c
...........\......\fw.LST
...........\......\fw.OBJ
...........\......\hid_kb
...........\......\hid_kb.hex
...........\......\hid_kb.iic
...........\......\hid_kb.lnp
...........\......\hid_kb.M51
...........\......\hid_kb.Opt
...........\......\hid_kb.plg
...........\......\hid_kb.Uv2
...........\......\hid_kb_Opt.Bak
...........\......\hid_kb_Uv2.Bak
...........\......\lp.h
...........\......\lpregs.h
...........\......\periph.c
...........\......\periph.LST
...........\......\periph.OBJ
...........\......\syncdly.h
...........\......\USBJmpTb.OBJ
...........\USBKB.SchDoc
...........\hid_kb
usbkeyboard

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