AST RESEARCH, INC.        TECHNICAL BULLETIN # 1533           7-19-96 
 
 
 
TITLE:  AST Vision 4i Monitors and ATI Mach64
 
 
SUMMARY 
 
   AST Vision 4i monitors will lose horizontal synchronization.
 
   This issue applies to all systems using the ATI Mach64 video 
   subsystem regardless of the manufacturer.


ISSUE 
 
   When connecting an AST Vision 4i monitor to any system that uses
   the ATI Mach64 video subsystem, the monitor may lose horizontal 
   synchronization (sync) under Windows 95. 
 
 
BACKGROUND 
 
   The monitor will lose horizontal sync when attempting to use a 
   resolution higher than 800x600.  The ATI Mach64 video drivers 
   v2.1x or lower are incompatible with interlaced monitors that 
   use resolution above 800x600.


ACTION 
 
   Download version 2.22 (AST part number 911374-317 through -322) 
   or later of the ATI Mach64 video drivers and follow the README
   onscreen instructions.

   Files 11374317.EXE, 11374318.EXE, 11374319.EXE, 11374320.EXE,
   11374321.EXE, and <A HREF="ftp://ftp.ast.com/D-VIDEO/11374322.EXE">11374322.EXE</A> are available from one of AST's 
   On-Line! services as follows:

   AST WWW Site:  http://www.ast.com 
   AST On-Line! BBS*:  See IB0001.TXT 
   CompuServe:  GO: ASTFORUM 
   Prodigy: Jump: astsupport


NOTES 

   Caution: If you exceed the rate parameters, you risk damage to the
   monitor.
 
 
TAN 002100SW
 
--------------------------------------------------------------------- 
The information in this data sheet is subject to change without  
notice. AST Research, Inc. shall not be liable for technical or  
editorial errors or omissions contained herein; nor for incidental or  
consequential damages resulting from the furnishing, performance,  
or use of this material. This material contains information protected  
by copyright. No part of this material may be reproduced in any form 
without prior written consent from AST Research, Inc.  
All rights reserved. 
---------------------------------------------------------------------