IBM's Voicetype Simply Speaking Gold works on the Point 510 and it therefore should work on the Stylistic 1200 also.
The "enrollment" for training the software to recognize your voice could take some time, but even with only partial completion of enrollment, voice recognition is very good.
Voicetype Simply Speaking Gold seems to be the highest you can go with the Voicetype products from IBM on the Point 510. I could not get "enrollment" to complete on the Point 510 for ViaVoice 98, ViaVoice 98 won't work (at least not with the Point's built in mic/soundcard).
So, the following versions of IBM Voicetype should also work with the Point 510 because they should have system requirements equal to or lower than Voicetype Simply Speaking Gold (which I KNOW works)
Voicetype Simply Speaking
Voicetype for Windows 3.0
Voice Pilot - Voice Pilot includes a run time version of Voicetype for Windows 3.0 and adds voice navigation (and some neat voice activated applets). IBM licensed voice navigation for its Voicetype products from the company that made Voice Pilot.
Voicetype Dictation (some of these require the special voicetype adapter card, there was a pcmcia version and an isa version of the card). I ordered version 1.32 that has the special pcmcia voicetype adapter card. There are versions of Voicetype Dictation that IBM says will work on a 486 machine but these versions require the VTD adapter card.
It is possible that the pcmcia "voicetype adapter card" from IBM could be a hot commodity, because it might be possible to use this card as a soundcard to get ViaVoice 98 to work on the Point 510 and to get voice control on 486 tablets like the Stylistic 1000.