How can you play Tombi ps1 game on the computer

I am pretty sure that you meant tomb A, but yeah, I get what you meant.
I guess the title depends on in which country you've bought it, as I've seen it called both Tombi and Tomba. Note: Emulators aren't always that dependable/reliable, but it is the easiest way to play your games on your computer. They can be illegal, so do not talk about illegal emulators.