Based on the ranks of single-chip application of the keyboard matrix, 4* 4 keys on behalf of 16 hexadecimal characters, and realize in the digital tube display 16 hexadecimal characters

key apply
.........\keybell.Opt
.........\keybell_Uv2.Bak
.........\keyboardscan
.........\keyboardscan.asm
.........\keyboardscan.hex
.........\keyboardscan.lnp
.........\keyboardscan.LST
.........\keyboardscan.M51
.........\keyboardscan.OBJ
.........\keyboardscan.Opt
.........\keyboardscan.plg
.........\keyboardscan.Uv2
.........\keyboardscan1.asm
.........\keyboardscan_Opt.Bak
.........\keyboardscan_Uv2.Bak
原理图.pdf

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