: (emit)
    DUP 0x08 = IF DROP _bs EXIT THEN
    DUP 0x0d = IF DROP _lf EXIT THEN
    0x20 - DUP 0< IF DROP EXIT THEN
    DUP 0x5e > IF DROP 0x5e THEN ( tilenum ) XYPOS @ _cell!
    XYPOS @ 1+ DUP [ VDP_COLS VDP_ROWS * LITN ]
    = IF DROP 0 THEN XYPOS ! ;
: VDP$
    9 0 DO _idat I 2 * + @ _ctl LOOP _blank
    ( palettes )
    0xc000 _ctl
    ( BG ) 1 _zero 0x3f _data 14 _zero
    ( sprite, inverted colors ) 0x3f _data 15 _zero
    0x4000 _ctl 0x5e 0 DO ~FNT I 7 * + _sfont LOOP
    0 XYPOS !
    ( bit 6, enable display, bit 7, ?? ) 0x81c0 _ctl ;