* R0 = Boolean flag
* R0 ! Message (or NUL if flag set, and no messages waiting)
Notes: The thread that called the SWI receives a message from its incoming message list, if there is one present. If not, the action can be twofold:
1. If the flag in R0 is NUL, then the thread will be suspended until a message arrives.
2. If the flag in R0 is TRUE, then a NUL pointer will be returned in R0
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