I'm in the process of getting a mongrel Sun 3/400
machine running as a
 host for my Symbolics UX400.  The UX400 support software requires
 SunOS 4.1 which I used to have on CD, but I now appear to have
 misplaced.  (I have a copy of 4.1.4, but it only supports Sun4 machines
 )
 Anyone have a copy they could make an image of?  (and yes,  I've
 confirmed that this machine will boot from CD.) 
    The last release of SunOS to support 68K ("sun3x" kernel architecture
 for the 68030-based machines, the 3/80 ad 3/400, all others are "sun3")
 is 4.1.1_U1.  I have boot tape images, but not a CDROM image.  I don't
 think I've ever seen it on CDROM for 68K. 
 
 If memory serves, it's still on the CD-ROM alongside SPARC, if you know
 where to look. I don't have my SunOS CD-ROMs with me to check, though.