map [cellx celly cellw cellh [sx sy [colorkey]]]
just use map function, where cellx, celly - world coordinates; cellw, cellh - width and height in cells of map region; sx, sy - screen coordinates to draw map. if you call map() without parameters TIC will draw first screen from the map editor.
map() == map(0,0,30,17,0,0,-1) by default