I am running V9T9 V6.0 under dosbox on a Pi 2. It seems to run fine with only the occasional keyboard lag-can't type too fast. I had a lot of trouble with ti99sim. The convert-cfg would't convert the roms. I had to download version 0.0.11 in ubuntu and run the convert then copy the roms over. I still couldn't find cartridge files that would convert and work so I gave up.