The following links provide useful background information for this microcontroller and using this controller board.
Data Sheets
AT89S8252 Data Sheet: Atmel - AT89S8252 Data Sheet
AT89S8252 Technical Library (Includes FAQ, Assembly Code Examples and more): Atmel - Technical Library
MAX232 Data Sheet: Maxim Semiconductor - MAX232 Data Sheet
Books
Programming: Programming and Customizing the 8051 Microcontroller
Programming:8051 Microcontroller, The: Hardware, Software, and Interfacing, 2/E
Useful Websites
Atmel: To Atmel website
Circuit Cellar Magazine: To Circuit Cellar Website
User Tips
If you have some useful tips or relevant information that would be helpful to other users, please send it to technical@futurlec.com