Amiga 1200: How to switch off Blizzard 1230 IV ?

[servitus]

Hi there.

I have an A1200 with a Phase 5 Blizzard 1230 IV accelerator card with AmigaOS 3.9 installed. Somebody told me that it should somehow be possible to switch on/off the card at runtime.

Does someone know more about that? Do I need additional software installed on the system? Which key does turn on/off the accelerator?

Many thanks in advance!

[servitus]

thanks for your answer. but this doesn't seem to work. I held "2" for the complete boot sequence, but when checking the system speed with SysInfo it still says that the accelerator is working...

[servitus]

thanks alot for the numerous suggestions. is there any (visual) feedback when the switching should have worked?

[servitus]

okay finally I managed it :-) thank you guys for your help - really great community!