Specifications: 40 I/O pin all the leads. Support chips: AT89C51/S52 STC89C52 and chip which pin-compatible. Power supply: power adapter or external expansion pin power supply (not support ISP download interface power supply) DC-005 Power Block (supporting the transposon is 5.5*2.1mm). Expand outside 4 channel VCC, GND. Reset: Power-on-reset and reset button. Power LED (D1) and the program run indicator (D2). Standard ISP download interface. Crystal: 11.0592M
