load_map
From ArchaicPixels: HuC and PCEAS Documentation
load_map(char sx, char sy, int mx, int my, char w, char h);
Load a part of a map on the screen. 'sx' and 'sy' are
screen coordinates (in tile unit; 16 pixels), 'mx' and 'my'
are position in the map, and 'w' and 'h' are respectively
the number of tile-index to load horizontaly and verticaly.
This function doesn't do any screen clipping, so you must
not pass incorrect or too big screen coordinates to it,
that would corrupt the video memory.
