Sorry to tell you it's not possible to boot PS1 games with ESR. ESR is for PS2 games and uses a hack for DVD video. Since PS1 bios and chip cannot play DVD or DVD video, it's no dice. PS1 boots CD's only.
Most PS2 contain PS1-on-a-chip inside you can goog it for more info.
Not a PSX noob at all just never joined this site! Thanks for having me.
I play alot of PSX or PS2 still and I like to see any mods, savegames, fun cheats etc.
Yes.
Yes. Flip top lid. Fleabay.
Yes. Yes. Some do but a lot don't. And you can lose all your saves. Do not buy the white 1.49 ones they are a scam and will fail when you reach over 50 percent. Then there are other 3rd party ones that maybe work.
Copy a full memory card over to it if...