The JS2051A1 CPU BOARD is a very small CPU board that uses an ATMEL AT89C2051 CPU. The AT89C2051 is an INTEL 8051 CPU compatible microcontroller. It has an extra analog comparator and internal 2K-byte Flash memory.
The JS2051A1 CPU BOARD has X-tal (22.1184 MHz), POW (Power On Reset) circuit, two LED's, test pin (GND), I/O extension ports. It is used for Mr. Line and Roamer.
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