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I'm using the uVision2 8051 eval version trying to see if it's worth leaving my normal asm enviroment. Natualy I have some asm functions that I would like to take with me, but I need to figure out how to call my asm functions. I have three different senearios that are quiet common among my routines, and I'm looking for help to integrate the two worlds of programming. This is how I would like the C code to look: unsigned char portbit unsigned char databyte unsigned char stream[8] bit Reset(portbit) byte DataIO(portbit,databyte) void DataOut(portbit,databyte) The asm works like this: Reset returns true or false in carry, and accesses a certan output bit. DataIO both sends and returns data in the accumulator. It, too acesses a port bit. DataOut is basically the same as the above, but it returns nothing. It will however change the contens in the stream. In other words... How do I make sure that the C routines communicates using the accumulator and carry. I'm looking forward to hear what to do. Regards, Flemming Steffensen