orangpelupa, you keep saying that Sony's implementation should use a higher internal resolution. What emulators can do this? How would you approach doing this technically? Is it even possible? If you have game code writing pixels into a frame buffers that match one half of the interlaced output resolution of the TV connected and the PS1 has fixed ram, how do you fake more vram, higher resolution buffers, higher resolution precision 3D co-ordinates without breaking games?
I would really be interested if there are any emulators on Windows, macOS or linux that can emulate PS1 and run game code at even 1080p internal resolution, let alone 4K.