The best description I know on the complexities of properly emulating the display hardware is this blog post: http://gamasutra.com/blogs/KylePittman/20150420/241442/CRT_S...
Neither NTSC or PAL have square pixels. Square pixels never existed until computers.
The best description I know on the complexities of properly emulating the display hardware is this blog post: http://gamasutra.com/blogs/KylePittman/20150420/241442/CRT_S...