This program is derived the traditional 51 to simplify the SCM keyboard scanning procedures, the statement in three ways to identify matrix keyboard column value, the program size is only 400-500 bytes for novice after 51 SCM scholars to further improve reference.

keyscan\keydcan
.......\keydcan.hex
.......\keydcan.lnp
.......\keydcan.M51
.......\keydcan.Opt
.......\keydcan.plg
.......\keydcan.Uv2
.......\keydcan_Opt.Bak
.......\keydcan_Uv2.Bak
.......\Text1.c
.......\Text1.LST
.......\Text1.OBJ
keyscan

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