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Doorbell with 30 melodies

1990, aim: the gift for friend, 1 developer
result: was granted and was used during several years
hardware: soldered controller board; languages: Assembler i8080; tools: developed at i8080 based computer

MC board and FW were developed: i8080, 2kB ROM, NO RAM (only registers of CPU), 30 cyclic 1 tone melodies.

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