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Onboard 4M crystal oscillator, the socket crystal frequency can be replaced at any time.The 4bit independent keyboard is connected to RB0 RB1 RB2 RB3.Standard RS232 communication interface, microcontroller board and computer communication interface.8 LEDs are connected to the RD port. When the J3 is plugged in, the LED is enabled. J3 is unplugged and the RD port is completely released.External 5V DC power interface send USB power cable without additional purchase. MORE DETAILS asin B0C7WKBL7F bestsellersrank 6,330 in Single Board Computers Computers Accessories datefirstavailable May 17, 2023 itemmodelnumber WALFRONTgtx5irqshf itemweight 5.9 ounces manufacturer WALFRONT packagedimensions 7.48 x 6.3 x 1.18 inches
