then subsequent
reads will return 0.&nbsp; What happens to this register when bits 4/5
of <A HREF="#Reg4200">register $4200</A> are <I>not</I> set is unclear.
Some SNES programs use a loop to read this register (in emu's, often getting
stuck in this loop) but why a loop is used is unknown.

<P><A NAME="Reg4212"></A><B><FONT FACE="Lucida Console">Register $4212:
Status register IRQ Register (1b/RW?)</FONT></B>
<PRE>vh-----j&nbsp; v: whether in vblank state&nbsp; h: whether in hblank state
&nbsp;&nbsp;&nbsp;&