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The MDE8051 development board contains a power supply, dual serial ports, a 2nd serial port via a right angle header, 8 LEDs and 8 switches, a reset button, a jumper to pull-up PORT0, a slide switch for programming, and female/male headers to access all ports.
Block Diagram
New and Improved 8051 development tool


Block Diagram:


(1). Power Input and 5V supply


(2). USB via UART0


(3). UART1


(4). Prog/Run SW


(5). P0 pull up jumper


(6). DS89C450 microcontroller


(7). 8 LED outputs


(8). Reset button


(9). 8 slider switch inputs


See Documents.