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Hi again, I want to thank Doug Evans for his instant answer to my previous question. I have another one: Is there a switch for gcc (68k) to force it not to use byte (char) operations? (I couldn't find something like this) All the variables I use are at least short. Nevertheless the compiler detects that from some variables just the lower byte is used: if((ist & SW_SRI) != SW_SRI){...} In the ready code move.b -11(%a6),%d0 and.b #128,%d0 tst.b %d0 odd memory addresses are accessed which causes really big trouble for my system. In the given case the preprocessor reduces #define SW_SRI 0x00f0 to just 0xf0. A precompilier switch to prevent that whould also be possible. Thanks in advance Jens