3 tile size&nbsp; b: BG2 tile size
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; a: BG1 tile size&nbsp; Sizes are: 0=8x8; 1=16x16. (See <A HREF="#Reg2107">reg. $2107</A>)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; p: order of BG priorities&nbsp; m: General screen mode</PRE>
This register determines the size of tile represented by one entry in the
tile map array, the order that BGs are drawn on the screen, and the screen
mode.&nbsp; The screen modes are:
<PRE>MODE&nbsp;&nbsp; # of BGs&nb