No, that's seriously wrong. In fact I don't know of any game that was 36k... but maybe I'm wrong here. Anyway, I know of many games for the TI that were only 8K (for instance the Romox games), and many that were 16K (most of the Atarisoft ones).
As for homebrews... well, that depends on what exactly you would consider a "homebrew". If you mean homebrew CARTRIDGES (Command Modules in TI slang), then you may be right. But TI offered some possibilities to program their machine. If you had the console only, you could only program in BASIC (and save your creations on tape, if you had the optional tape adapter). If you bought the minimemory module or the rather pricey expansion box with the 32K expansion, you could also write games in Assembler. And there were several small companies who sold disk-based games for the TI-99. For instance, I have @APESOFT's "Cerberus". Now the question is if you could consider this a homebrew since, of course, you could consider @APESOFT a company... but I'm not sure if it was.
If you count games programmed in BASIC or EXTENDED BASIC as homebrews, then I'm sure there are literally thousands or millions of them... I have personally written about 100 programs for the TI-99 in EXTENDED BASIC.
And by the way, even professional companies did some "hacks". If you listen to the sounds of Atarisoft's TI-99 version of "Protector" closely, they will strangely remind you of those of TI's own "Tombstone City", whose source code was released on the pack-in disks for their "Editor/Assembler" module, which you needed to write machine language programs for the expanded TI-99.
hey man. ok i found somestuff here, I also just picked one uo at the flea market for 5 bucks on e game all the wires and the original controllers.
http://www.old-computers.com/museum/comput...?st=1&c=236