Amongst some TRS-80 Model 16 parts I picked up this past weekend is a board I can't identify. It's labeled as a "Tandy 16B Adapter", PCA 00717000 REV 0. It doesn't seem to have much on it, a few TTL chips and a 50 pin connector. I put a pic up at: http://yahozna.dyndns.org/scratch/IMG_0165.JPG