UART library for x51, can be used with any c cross compiler and can be used for X51 uC. I had used keil.

Work IrDa x51-Work IrDa x51

simple program to calculate and implement the analog to digital conversion in a x51 architecture based embedded controllers

AMT630A Emulator and Firmware AMT630A firmware for mini TFT screens The AMT640A is a relative common video controller chip found in cheap mini TFT screens with composite input. Those screens are often sold as "car rear view monitor"