I've just downloaded and installed TI99/Sim for Linux. It's really solid, it doesn't slow down at all and runs well ... the creator has done an update in 2014..... For the moment, it operates through the Terminal for launching, and supposedly for launching with a cartridge (GUI to come later).
A terminal program called Convert-ctg is supplied with the download .... with all the right files in it's path, the command convert-ctg ParsecG.Bin should rightly convert the .bin file to a .ctg which the emulator uses.
Indeed, this had to be done to obtain the right ROM image in order for the emulator to work ... the program was successful converting the 994aGROM.BIN into a ctg.
The part I'm struggling with is getting games to convert. It will do Tombstone City and even tell me there's a file there called tombstone city .... so after putting the game into the relevant folder I try to boot with the cartridge ... the screen blanks then comes back on, and I get this message from Terminal : - "Segmentation Fault (Core Dumped)" .... this has happened with all of the games I got from the net.
Does anyone out there know why I'm getting this, or how I can get around this?