Hi, We just changed our CPU from ST10R167 to a ST10F276 and plan to uses our existing code. We uses the ST10flash tool to program our application (less than 24K in size ) in segment 0 of the Internal Flash memory (ROMS1 = 0 and ROMEN = 1 from SYSCON). The code is programmed but when we try to run it (EA = 1 on boot up) the code is not running. On the same board, we still have our old 29F400 flash and the same code is running well when we boot up with EA =0 (at difference of ROMEN = 0 from SYSCON). What are the other changes to our code in order to run from it the internal flash memory?? Also, is there any ways to run from the internal flash and still have access to the external buss at the same time. I did not found any information on ST site to have the internal flash enabled and at same time of the external bus activated. Thanks