collapseos/blk/808

lblnext BSET PC 0x1d - ORG @ 0x1b + ! ( next )
    ( ovfl check )
    BP SP CMPxx,
    IFNC, ( BP >= SP )
        SP PS_ADDR MOVxI, BP RS_ADDR MOVxI,
        DI 0x13 ( oflw ) MOVxm, JMPs, L1 FWRs ( execute )
    THEN,
    DI DX MOVxx, ( <-- IP ) DX INCx, DX INCx,
    DI [DI] MOVx[], ( wordref )
    ( continue to execute ) L1 FSET