AT89S52-based single-chip, voice chip ISD4004 drive for recording/audio and other functions, also added a touch-screen LCD features and functionality, 7843.h is part of a touch screen driver, 12864.h is part of LCD driver. 4X4 matrix key.h is part of the keyboard driver.

ISD4004_7843
............\12864.h
............\4004.c
............\7843.h
............\comm.h
............\key.h
............\readme.txt

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