Dual boot between os3.1 and os3.9

[rare_j]

How might it be possible to set up a system that can dual boot between os31 and os39?

I've got a really nice os3.1 set-up on my A1200 on the first IDE drive, and I've got a load of space spare on an unused partition on the second IDE drive that I could load os39 on.

The only way I can think at the moment is to swap the boot priority of the partitions and reboot, or maybe do something with disabling automount or something but I cant think how it could work.  :-?

[rare_j]

Thanks for the suggestions. The program changebootpri looks promising but without any doc included in the archive I'm not going to touch it.
The idea of a custom startup-sequence to assign stuff to different locations depending on what os you want to use also seems preety cool, but I imagine it could get horribly complicated.
Booting from the CDROM is a nice idea but I imagine running os39 from it would be s-l-o-w! Also tricky to set up as I don't have a cd-burner on the A1200.
Anyway thinking about the CDROM idea made me realise my IDE splitter and driver enables booting from ZIP which will do for the time being... it will still be pretty s-l-o-w running os39 from a ZIP but at least it's easy... if the ZIP is inserted and bootable after the IDE driver is made resident it takes priority over the HDD.

EDIT looks like changebootpri is actually written by Thomas... he seems to know what he's doing with hard disks so I'll give it a try.