The best way to see what's up is to put in the Solaris9 software V1 disk and view the table of contents.
In order to do so on a CD, you must stop the volume management service.
If you are going to be making a Solaris 9 bootable cdrom, you will want to know how to extract the slices onto your hard drive so you can make iso's.
Slice 0 is just a filesystem, so you can copy it with cpio and volmgmt should be running.
Slice 1 is a filesystem plus some other stuff, so you have to dd it, as well as the rest of the slices, below is a command to copy the other 5 slices at once. Volume management must be stopped.
Modifying the images
Literally 99.9% of the work needed to tweak jumpstart configurations is on slice 1, very little is done to slice 0 in Solaris 9 images. It seems they moved a lot of it out of slice 0 and there now is a symlynk from slice0/Solaris_9/Tools/Boot to slice 1 instead.
The principal tool for modifying these dd images is lofiadm. To mount one of the images, run the following.
You may then make the necessary changes.
When done, unmount by running the following.
Mounting any other slice than s1 in this fashion produces only a file that is a boot redirector to slice 1.
Creating an iso
There is a single line command that will produce an iso of all the images. Another source mentions a way that involves several steps of cat'ing, etc. Both are valid.