How do i get bios on old mac pro 2009?

Hey there how do I get to my bios on an old Mac Pro 2009 I don’t really remember the keyboard shortcuts do you guys remember them

Ps I have an old gateway keyboard

So, option key on an old mac keyboard, I think, is the alt key on a PC keyboard.

About the shortcuts… The ones on these pages looks somewhat familiar:
Mac startup key combinations - Apple Support (Intel-Based)
Mac Startup Keys Cheat Sheet - Kapeli
Hope this helps…