: (emit)
    DUP 0x08 = IF DROP _bs EXIT THEN
    DUP 0x0d = IF DROP _lf EXIT THEN
    0x20 - DUP 0< IF DROP EXIT THEN
    XYPOS @ CELL!
    XYPOS @ 1+ DUP [ COLS ROWS * LITN ]
    = IF DROP 0 THEN XYPOS ! ;