80C552, 68HC11 and 8051 Links and Downloads 

Philips  80C552 information Motorola  68HC11 information  Intel  8051 information 8051 Source Directory Intel's ApBuilder  A software tool produced by Intel that can assist you to develop assembly-language code, such as peripheral initialization sequences, for Intel microcontrollers.  Beware!! This tool is NOT a substitute for your knowledge of the functioning and correct use of on-chip resources.  If you do not gain this knowledge through reading and experimentation with the microcontroller, ApBUILDER will just confuse you. 8051 Simulator. It's documentation is in German and a little bit of English, but if you play with it, you'll get the hang of it Embedded Star  Embedded Systems and Software Resources 8051 Stuff  Examples and Software for the 8051 Computer5 Computer Directory