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AT89S52 microcontroller development board with digital PCB bare board / schematic / routines|board board|board digitalboard pcb - AliExpress
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Atmel Semiconductor AT89S52-24PU Microcontroller Unit, 8-Bit, AT89 CISC, 4KB Flash, 5 Volt, 40-Pin, PDIP, 13.97 mm W x 4.83 mm H x 52.58 mm L (Pack of 2): Amazon.com: Industrial & Scientific
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