: contents 16 0 DO large? IF 3 ELSE 0 THEN I 3 + AT-XY
    64 I * BLK( + DUP 3 col- + SWAP DO
        I C@ 0x20 MAX EMIT LOOP LOOP
    large? IF 3 16 gutter THEN ;
: selblk BLK> @ PREVBLK ! BLK@ contents ;
: pos! ( newpos -- ) EDPOS @ PREVPOS !
    DUP 0< IF DROP 0 THEN 1023 MIN EDPOS ! ;
: setpos ( -- ) EDPOS @ 64 /MOD
    3 + ( header ) SWAP large? IF 3 + ( gutter ) THEN
    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 ) 4 col- nspcs SWAP 4 SWAP AT-XY ( buf c )
    SWAP C!+ IN( _zbuf (rdln) IN( SWAP 63 MOVE ;