Hi, I was wondering how far development has come, think i read on a post somewhere that it is not possible to run custom made applications on xbox360, however that post was years old. Is it still only signed software that runs on xbox360?

I would like to play tekken and as the xbox360 is backward compatible, i hope for PCSXBOX to run, so i can emulate a PS1

forget it.
a) it will only run signed code.
b) the backwardscompatibility is locked to specific games and does not support all functions, so most xbox1 apps wouldn't run anyways.