The Asteroids Partycade 4:3 monitor. Here’s the converter which I’ve bought before and had no issues with on another A1Up 4:3 monitor. GeeekPi NT68676... https://www.amazon.com/dp/B084NWYRX4?ref=ppx_pop_mob_ap_share
https://www.amazon.com/gp/product/B084NWYRX4
Not sure if it will work yet though!