Have previously written matrix keyboard, c voice programming. There are simulation diagram

矩阵键盘
........\Last Loaded lesson_1.DBK
........\Last Loaded lesson_2.DBK
........\STARTUP.A51
........\STARTUP.LST
........\STARTUP.OBJ
........\leeson_2_1
........\leeson_2_1.LST
........\leeson_2_1.M51
........\leeson_2_1.OBJ
........\leeson_2_1.__i
........\leeson_2_1.c
........\leeson_2_1.hex
........\leeson_2_1.lnp
........\leeson_2_1.plg
........\leeson_2_1.uvopt
........\leeson_2_1.uvproj
........\leeson_2_1_uvopt.bak
........\lesson_1
........\lesson_1.DSN
........\lesson_1.LST
........\lesson_1.M51
........\lesson_1.OBJ
........\lesson_1.PWI
........\lesson_1.__i
........\lesson_1.c
........\lesson_1.hex
........\lesson_1.lnp
........\lesson_1.plg
........\lesson_1.uvopt
........\lesson_1.uvproj
........\lesson_1_uvopt.bak
........\lesson_2
........\lesson_2.DSN
........\lesson_2.LST
........\lesson_2.M51
........\lesson_2.OBJ
........\lesson_2.PWI
........\lesson_2.__i
........\lesson_2.c
........\lesson_2.hex
........\lesson_2.lnp
........\lesson_2.plg
........\lesson_2.uvopt
........\lesson_2.uvproj
........\lesson_2_2
........\lesson_2_2.LST
........\lesson_2_2.M51
........\lesson_2_2.OBJ
........\lesson_2_2.__i
........\lesson_2_2.c
........\lesson_2_2.hex
........\lesson_2_2.lnp
........\lesson_2_2.plg
........\lesson_2_2.uvopt
........\lesson_2_2.uvproj
........\lesson_2_2_uvopt.bak
........\lesson_2_uvopt.bak
........\lesson_3.DSN
........\lesson_3.PWI

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