Sets the return stack pointer to a new address.
Care should be taken when setting the return stack address. Generally, the contents of the old return stack should be copied to the new location before setting the return stack address, or a crash will almost certainly ensue.
Note: V1.2 does not contain RP! however, it is possible to set the return stack address with the following assembly code:
ASM: RP! ( addr -- )
*SP+ R3 ** MOV, \ load R3 (return stack pointer) with addr
;ASM
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