Nice. It's difficult enough for me to follow TMS1000 code! I haven't updated MAME in several months, so I'll grab the latest.

I put up the info on Gakken Invader 2000: http://www.seanriddle.com/tms1100.html#inv2k

I figured out how to electronically dump the TMS1370-28, and it matched my visual dump.

I didn't know how you will map the VFD segments to the 1370's R1-R10 outputs and the TMS1024's outputs, so I created a mapping table in the hardware description text file. If you have any questions let me know, or tell me what codes to put in the segment titles and I can add them.