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8051 Development System Circuit Board
8051 Development Board v1.0 - Arnab Kumar Das
AT89S52 Minimum Development Board - 8051 Tutorial #2
Interfacing LED using push button switch to 8051 microcontroller-AT89S51
PPT - 8051 Hardware Architecture PowerPoint Presentation, free download
8051 Development Board v1.0 - Arnab Kumar Das