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in reply to rpozz: We are used to the fact that we wait for a SWI to end before continuing the program but I don't know if you ever worked with the APEX card from Millipede. It has an ARM processor on board and when calling a SWI from the RiscPC, you can decide if you wait for the SWI to end or not (or was it the SWI deciding it?) On the other hand, calling a SWI would be a good time to swap tasks.

In reply to Douglas: In interrupts you allways have to provide appropriated locking mechanisms so no difference here.

 is a RISC OS UserPeter on 25/10/03 7:15PM
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