The source code for USB GPIF. It was verifed.

gpif_to_extfifo fifo rw
.......................\dscr.a51
.......................\dscr.LST
.......................\dscr.OBJ
.......................\dscr._ia
.......................\EZUSB.LIB
.......................\fw.c
.......................\fw.LST
.......................\fw.OBJ
.......................\fw.__i
.......................\gpif.c
.......................\gpif1.c
.......................\gpif1.LST
.......................\gpif1.OBJ
.......................\gpif1.__i
.......................\gpif2.gpf
.......................\gpif_extfifo2
.......................\gpif_extfifo2.hex
.......................\gpif_extfifo2.lnp
.......................\gpif_extfifo2.M51
.......................\gpif_extfifo2.Opt
.......................\gpif_extfifo2.plg
.......................\gpif_extfifo2.Uv2
.......................\gpif_extfifo2_Opt.Bak
.......................\gpif_extfifo2_Uv2.Bak
.......................\lp.h
.......................\lpregs.h
.......................\periph.c
.......................\periph.LST
.......................\periph.OBJ
.......................\syncdly.h
.......................\USBJmpTb.OBJ

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