Dual Booting OS3.x and OS4 on classic

[tribz]

I'm wondering how fellow classic users dual boot their systems. I'm still in the process of setting both os's up having recently returned to the amiga scene so I havent actually got to the dual boot stage yet.

Does disabling the maprom feature on the PPC card have any real impact when working under 3.x?

How do you choose which partition to boot? Do you have one set as default and then interupt the boot (both mice buttons if I remember correctly) to choose a different partition to boot from?

Thanks
tribz

[mfilos]

I triple boot both my A4000 and A1200 (OS3.9, OS4.0 and MOS PUP) without any problems.

Both miggies have 3 partitions under the first 4GB of the HD.
DH0 = 3.9
DH1 = 4.0
DH2 = MOS

I have Bootpriority = 1 in DH0 and 0 in the other 2 partitions. MapRom is definitely Off!
So the system boots always in 3.9 unless I choose from the Early Startup Menu to Boot in DH1 or DH2. That way I can boot whatever system I like per case.

Only drawback is in 4.0 where you need to go to the Early Startup Menu once more after the new Kickstart loads in order to choose DH1 again, or else it tries to boot 3.9 with 4.0's kickstart = blank screen.

There are utilities like Thomas changebootpri that can change the bootpriority from script but I haven't even bothered yet.

You can check a demo video I took from my A4000 some months ago to check it out here... (don't mind the Greek though lol)

[tribz]

Nice video, thanks for that. Useful to know for when I get to the dual boot stage. So the maprom thing wont have any impact leaving it disabled?

Thanks
tribz

[mfilos]

Not at all

[Crumb]

@mfilos

you can change kicklayout to include a textfile with a text with the same name as the OS4 partition. That way OS4 will boot from that partition, no need for early boot menu :-)

[derringer3]

Get an ATA Mobil rack so you can switch between the two os by hardware.