From: Mark C. Spaeth <mspaeth@mtl.mit.edu>
Subject: Zaxxon Vertical Flip Hack
Date: Monday, January 18, 1999 12:21 PM

For Zaxxon, sega decided to rotate the monitor counter clockwise insstead
of clockwise like in midway and konami games, so it played upsidedown in
my jammatized vertical cocktail...

To flip the video:

Cut the trace leading to U55/11
Wire U55/11 to U93/2
Wire U93/3  to U92/1
Wire U93/1  to U93/14  *

* To make the hack reversible, put a 4.7k resistor between U93/1 and U93/14
  and wire a switch between U93/1 and ground

Thanks to David Haynes for the schems, and Andy Warren who proposed a
similar hack.

-- 
Mark Spaeth                       mspaeth@mtl.mit.edu
60 Vassar St., #39-629            mspaeth@mit.edu
Cambridge, MA 02139               
(617) 253-0719                    http://spaeth.ne.mediaone.net/~mspaeth