Parsec was 2D horizontal smooth scrolling. It wasn't full screen, but the scrolling screens in this demo generally contains repetitive graphics, which would allow them to use a number of possible tricks.

I actually downloaded and tried the demo on the Classic99 emulator, and it works exactly as advertised.

Would love to see actual hardware demo though.

check out another demo here by one of the coders of the megademo https://www.youtube.com/watch?v=Guv_Jp3m-vw this is video from my 99/4a screen real hw.. my boot menu is a gram device so it's a little different..

Same here, it works even with the F18A option disabled. So I apologize to these talented developers!

No problem ;)

I have the real hardware ready to go, but I don't currently have an easy option for getting software from the internet onto it. I see they made a ROM cartridge version of it; if they ever make a run of those for sale I'll definitely grab one.

you are in luck they are available soon as I get the labels in also many other new TI-99/4a games, expansions etc including 32k if you don't already have it

FYI, a kind member of the atariage forums will be burning carts for cheap. if anyone is interested just stop by the forums there.