 the visible regions or the clipped regions.&nbsp; For example, if pixels
10-20 and 50-60 are clipped, I don't know whether OR or AND would be used
to clip both regions and which would clip neither.

<P><A NAME="Reg212E"></A><B><FONT FACE="Lucida Console">Register $212E
and $212F: Window designation (2*1b/W)</FONT></B>

<P><TT>$212E&nbsp; Main-screen window designation</TT>
<BR><TT>$212F&nbsp;&nbsp; Sub-screen window designation</TT>
<BR><TT>For each of these:</TT>
<BR><TT>---sdcba&nbsp; s: sprites enable&n