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.