A bad-screen PowerBook 160, with a monitor attached showing the desktop and cursor, but no menu bar or icons since it isn't the main monitor

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   LikesOldMacs (likesoldmacs@bitbang.social)'s status on Sunday, 30-Jul-2023 09:08:34 JST LikesOldMacs

   Question: how would you get this PowerBook 160 to boot with its main screen as the external monitor? If I made a bluescsi HD image with the correct monitor selected on a similar functioning PowerBook, would the setting stay with the HD or is it a PRAM thing? Or is there a secret keyboard command for mirroring?