File list (Check if you may need any files):
51SPI
.....\SPI总线在单片机系统中的实现
.....\...........................\SPI
.....\...........................\SPI.ASM
.....\...........................\SPI.c
.....\...........................\SPI.hex
.....\...........................\SPI.LST
.....\...........................\SPI.M51
.....\...........................\SPI.OBJ
.....\...........................\SPI.Opt
.....\...........................\SPI.plg
.....\...........................\SPI.tmp
.....\...........................\SPI.Uv2
.....\...........................\SPI_Opt.Bak
.....\...........................\SPI_Uv2.Bak