( native words )
CODE EXECUTE 1 chkPS,
    DI POPx, JMPn, lblexec @ RPCn,
CODE >R 1 chkPS,
    BP INCx, BP INCx, [BP] 0 POP[w]+,
;CODE NOP, NOP, NOP,
CODE R>
    [BP] 0 PUSH[w]+, BP DECx, BP DECx,
;CODE
CODE 2R> 2 chkPS,
    [BP] -2 PUSH[w]+, [BP] 0 PUSH[w]+, BP 4 SUBxi,
;CODE
CODE ROT ( a b c -- b c a ) 3 chkPS,
    CX POPx, BX POPx, AX POPx,
    BX PUSHx, CX PUSHx, AX PUSHx,
;CODE