Yeah, my ML-102 background plastic is very wavy, so it was probably left out in the heat.

Rich Burbage emailed me asking for info on Dark Tower. He's doing board repairs and has found 6 different PCB revisions so far: http://www.voiceofthemummy.com/Pages/CircuitBoards.aspx

The TMS1400 on the newest revision has the TMS1100 pinout. I'm guessing TI did a cost reduction by removing the extra I/O (the 28-pin TMS1400 and 40-pin TMS1600 have the same die, but the extra pins aren't bonded out on the TMS-1400). So it is essentially a TMS1100 with double the ROM and a 3-level stack.