C51 electronic bell procedure is well-suited to beginners, and deserve careful look at

ALARM
.....\ALARM
.....\ALARM.BIN
.....\alarm.c
.....\alarm.c.bak
.....\ALARM.DSK
.....\alarm.H
.....\ALARM.HEX
.....\ALARM.LST
.....\ALARM.M51
.....\ALARM.OBJ
.....\alarm.PRJ
.....\alarm_keyboard.c
.....\ALARM_KEYBOARD.LST
.....\ALARM_KEYBOARD.OBJ
.....\hc595.c
.....\HC595.LST
.....\HC595.OBJ
.....\hc595drv.h
.....\sd2k3drv.c
.....\sd2k3drv.h
.....\SD2K3DRV.LST
.....\SD2K3DRV.OBJ
.....\TEMP.LST
.....\type.h
.....\WAVE.LIN

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