There are a great many modern modifications available for the 8-bit Ataris, many of them from Poland where the machines saw good sales quite late compared to the US.

Using modern electronics (FPGAs etc.), processors, and high-density memories, you can imagine the processing, graphics, and I/O improvements that can be made for relatively low cost.

Many hobbyist machines at this point are highly modified, with much new software taking advantage of the new features, so specifying "classic unmodified" pretty much means a system into which you could have slapped a ROM cartridge purchased at your local computer store back in the day. XL/XE sounds like it rules out the original 800 and 400 models.

> I love seeing new games for "retro" machines, it's awesome that people keep pouring time and love into them after all these years.

Same here, which is why I have more games to play than I care on my lifetime, without bothering with whatever subscription services, or games measured in GB/TB.

The 1200XL was super rare. Normally they mean the 800XL or 65XE which were pretty much the same except for the case design.

XL/XE means any xxxxXL and xxxXE.