In October 2016 I tested (but didn't share here) a simple circuit that used not only SPI data output as orignial Xorya, but also SPI sync, and consisted of one 74F00 and two 74F74s that (with help of NTSC color generator chip AD725) may allow us to get "true" CGA 4-color 320x200 mode with the same PIC32 and slightly extended XORLib (so it might be the next generation PIC32 video console Xorya-II capable of running some classic CGA games from PC):

Problem is I didn't capture actual schematics at that time and now I don't remember how exactly it worked...