Yeah, that bigtrak site looks informative enough for making emulation happen. =)

If someone wants to add it now, the romdump is confirmed and here are the PLA files:
tms1000_bigtrak_opla.pla: http://pastebin.com/Fpkv235j
tms1000_bigtrak_mpla.pla: http://pastebin.com/Vs7F6UyL
If not, I can add it later, in a week or so.