Looks interesting - wonder how the SD carts would work with this?
https://atari.com/products/atari-2600-plus?_kx=FzlhZNIFAGkvW3nYwv1Ev89lixfAm3O75Rx0LPAQ0s0%3D.Vvtdy7
ProSystem 1.3e
*Insert RetroArch version here*
ProSystem 1.3f
ProSystem 1.3g
*Insert JS7800 version here*
Other builds stating 1.3e will be similar to RetroArch, containing perhaps a hack or fix for one or two games, but overall compatibility is v1.3e.
JS7800 sources really need to be leveraged for 2600+.