How do I 'tell' the toolset (not using uVision but .BAT) to address all 23 bits without invoking bankswitching or other such slowdowns? Erik
For the MX, you must use CX51.EXE. The MX is a different instruction set and requires a different compiler. The CX51.EXE only compiles in MX mode. The C51.EXE NEVER compiles in MX mode (only in 8051 mode). Jon