Happy to see the love
One big development for the 99/4A which is cross-platform is Matthew's F18A, an FPGA replacement for the TMS-9918A, variants of which wound up in numerous other systems, like the MSX, ColecoVision, and more†. It gives the system SVGA output, new screen modes, multi-color sprites, has an option to eliminate the five-sprite-per-line limitation, and provides a fast implementation of the 9900 in the GPU (yes, the 99/4A can now be a multi-processor computer.)
There are a lot more expansions enabling better programming and gaming, and better portability, really showing the 99/4A as a capable peer of the better-known systems of its era, like the Commodore 64 and Atari 8-bits. A number of folks in the AtariAge forum‡ have Lotharek floppy emulators in the full-size PEB, or use the scaled-down nanoPEB which puts 32k, floppy emulation with a CF card, and an RS-232 interface on a small side-car module. Competent emulation like Classic99 and MAME can provide your gaming fix without the real machine as well as a super-fast development platform††.
Games abound including a monthly game contest where other members pony up TI-related prizes to the winners, loads of programming options like gcc, TurboForth, file-based fbForth, many options for assembly, a fantastic Extended BASIC compiler. Too much to really detail, you just have to see for yourself.
† http://codehackcreate.com
‡ http://ti99.atariage.com
†† http://www.harmlesslion.com/software/Classic99 and http://www.mame.net
Biting the hand that feeds IT
