8051 chip：

The IO port description
●  LED: Connected to P0
●  7-segment LED: Segment connects to P0, and bit selection connects to P2.
●  1602 LCD: RS connects to P2.5, R/W connects to P2.6, E connects to P2.7，data port connects to P0
●  12864 LCD: RS connects to P2.5, R/2 connects to P2.6,E connects to P2.7, data port connected to P0, PSB connects to 2.4，RST connects to 2.2
●   4x4 keyboards matrix：line connects to high 4 bits of P1port，alignment connects to P3^2、P3^3、P3^4、P3^5
●   Four independent key：connect separately to P3^2、P3^3、P3^4、P3^5 and share keys :S14、S15、S16、S17 with 4x4 keyboards matrix
●   Four AD signal：Potential meter connects to P1^0，photo resistor connects to P1^1，thermal resistor connects to P1^2 and supply voltage connects to P1^3
●  Clock chip DS1302: SCLK connects to P1.6, RST connects to P1.7, I/O connects to P3.5
●  Temperature chip DS18b20: DQ connects to P3^7
●   Infrared decoder chip: Connects to P3.3
●  SD CARD Port: Connects to P1
●   Port 1：P3^0，P3^1 connects to RS232 through Hay wire, and also to USB
●   Port 2：P1^2，P1^3 connects to RS232 through Hay wire, and also to USB

STC 8051 Standard Kit, an ordinary development board with 51 micro-controller, uses acquiescently STC micro-controller.
STC 8051 Standard Kit can be configured to work in either RS-232 mode or USB mode port through jumper.
STC 8051 Standard Kit is stable and has rich resource, such as color TET port, 128x64LCD port, 1602LCD port, SD slot, etc.

http://www.siliconray.com/stc-8051-standard-kit.html