: pos! ( newpos -- ) EDPOS @ PREVPOS !
    DUP 0< IF DROP 0 THEN 1023 MIN EDPOS ! ;
: setpos ( -- ) EDPOS @ 64 /MOD
    3 + ( header ) SWAP 3 + ( gutter ) SWAP AT-XY ;
: cmv ( n -- , char movement ) acc@ * EDPOS @ + pos! ;
: buftype ( buf ln -- )
    3 OVER AT-XY KEY DUP EMIT
    DUP 0x20 < IF 2DROP DROP EXIT THEN
    ( buf ln c ) 63 nspcs SWAP 4 SWAP AT-XY ( buf c ) SWAP C!+
    IN( _zbuf (rdln) IN( SWAP 63 MOVE ;