collapseos/blk/247

: THEN,
    DUP PC          ( l l pc )
    -^ 1-           ( l off )
    ( warning: l is a PC offset, not a mem addr! )
    SWAP ORG @ + BIN( @ - ( off addr )
    C!
;
: FWR BSET 0 A, ;
: FSET @ THEN, ;