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: XYPOS [ GRID_MEM LITN ] ;
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: _cl* COLS LINES * ;
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: AT-XY ( x y -- ) LINES * + _cl* MOD XYPOS ! ;
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: _lf
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XYPOS @ BEGIN ( pos )
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0 ( blank ) SWAP TUCK CELL!
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1+ DUP COLS MOD NOT UNTIL
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_cl* MOD XYPOS ! ;
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: _bs 0 ( blank ) XYPOS @ TUCK CELL! ( pos ) 1-
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_cl* MOD XYPOS ! ;
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