It's pretty easy.  Go ahead and download the version of OnTap you want to use (Intel of course).  Grab the disks and make them, too.  Extract the new OnTap (Intel) to the 740 that's in place using the standard OnTap upgrade procedure.  Down the original 740 and swap heads.  Boot with floppies on the 840.  When normal boot is complete, log in and run "download" command.  Reboot again without the floppies and it should be good to go.  Did this 2 months ago.  Went smooth as glass.
-----Original Message-----
From: Uros Lampret [mailto:uros.lampret@ourspace.si]
Sent: Friday, October 26, 2001 7:06 AM
To: toasters@mathworks.com
Subject: Upgrade from F740 to F840

Hi!
 
I intend to upgrade from F740 to F840. I will only swap heads and keep the disks. I can't seem to find document describing this procedure. Any body done that?
How do you change ONTAP from Alpha to Intel version?
 
Regards, Uros