DS994a v2.9 released. DS994a is a Texas Instruments TI99/4a Emulator for the DS/DSi/XL/LL. To run requires the TI BIOS ROMS in the /roms/bios or /roms/ti99 directory. See BIOS files further down for the ones you need.

DS994a changelog:
Added favorites system - press SELECT when choosing a game to mark it as 'like' or 'love'.
Added NTSC True-Sync to provide for a reasonably tear-free video experience by synchronizing the DS LCD refresh with the TI99/4a emulated video output.
Added support for 2MB, 4MB and 8MB SAMS 'Machine Type' configurations. Please note that if you select 4MB or 8MB, the maximum cart size you can load will be reduced to 6MB or 2MB respectively.

Download: DS994a v2.9
Source: Here