OS3.9 and OS4.0 in the same Amiga...

[flaviosr]

Hi,

is it possible to have OS3.9 and OS4.0 in the same Amiga with a boot selector?

Thank you

[flaviosr]

doctorq wrote:
@bigmac

Make two bootable partitions, and use the early boot menu for starters.

Does not work! I disable DH0 (OS3.9) leaving only from DH1 (OS4.0) on but the Amiga hangs! If I remove the boot flag in HDToolBox OS4.0 starts!
Suggestions...?

[flaviosr]

zipper wrote:
You have to tinker with boot priorities and boot from early startup screen to be sure that you get not the wrong patch loaded before the real startup happens. I have no problems with 3.9 and 4.0 lurking on different partitions.

I have a boot priority of 0 for DH0 (OS3.9) and DH1 (OS4.0) and 5 for DF0... which priorities do you have?

[flaviosr]

countzero wrote:
os 4 needs to run setpatch and start again. so be sure to catch the second boot and disable dh0 again.

an easier method is to give a higher priority to os 4. this way it will directly boot to ps4 without any problems. for os 3.9, you need to enter boot menu and select dh0 for boot device. but remember, if you have romupdate patches in your setpatch, it will restart, so you need to catch it and select dh0 again.

I have a 3.9 rom in my system, so I skip romupdates, which boots to 3.9 without any restart.

I have modified so that now I have DH0, priority 0 (OS3.9) and DH1, priority 1 (OS4.0).
OS4.0 is ok but, when I disable DH1, OS3.9 does not start!
The Amiga asks me for a floppy in DF0!!! Really strange.
I have OS3.9 plain right now (I am still in a WIP. Base installation + IDEFix + Picasso96 + MUI...