Hi Gerben,
1. you can download the images from the bootfloppies and such from
http://download.info.apple.com/Apple_Support_Area/Apple_Software_Updates/MultiCountry/Enterprise/
2. On OSX 10.6.3 you can make an ISO image from the NeXTSTEP 3.3 intel CDROM as follows
- insert disk
- click "ignore" on "the disk you inserted was not readable by this computer"
- open /Applications/Utilities/Disk.app and look what device the CDROM has in your machine, e.g. "disk2s0"
- open a terminal, log in as root and create an ISO imagefile by
dd if=/dev/disk2s0 of=/tmp/NS33_intel.iso bs=512b
You can then connect this image to the CD/DVD-device of parallels
I got NeXTSTEP 3.3 intel working without problems on parallels 5.0.9344
I don't know if it was necessary, but i used the 3.3 the beta-drivers e.g. [IDEDISK DUALEIDE ATAPICONTROLLER 3.35]
I have'nt had time yet to document the procedure, but no special magic is needed. Let me know if you need more help.
BTW, was it from you that I bought a 4.2 Postgress port on 17 okt 1994 for NeXTSTEP 3.3 ?