Hi, I'm having difficulties using MPL (macros) and the C-style preprocessor in A51 (6.12). Whenever I use #define (C-style prepro) to declare something and activate MPL (cmdline opt: MPL; uV2: Project | Options for ... | A51 | MPL), the file won't assemble. (You may want to try this source: --------------------------------- #define just_a_test 25 end --------------------------------) Any known solution to this behaviour? bis die Tage... Mathias