Hello, The software I'm developing has an array size of 800KB, which I successfully allocated using xhuge and both BUSCON1 and BUSCON3 set to 1 in the .a66 file. The problem arises when I want to run the code in debug mode so I can single-step through the code and look into the memory window. It seems that debug mode only works when I set BUSCON1 to 0. So far I'm unable to configure Keil's uVision3 to allow both the debugger and my code to share the RAM on BUSCON1. Thanks!