Originally Posted by hap
Quick question: on TMS1990, do you know which pad(as visible on die edge) goes to which pin?
I'm pretty sure that the top left pad in my pics is pin 24, with numbering going CCW. So the top of the die has all the O outputs. The first pad down the right side (partially under the plastic blob) is VSS (positive power), with VDD below it.
Notice that there are 29 pads! It looks like the one that's fourth down on the right side is also connected to VSS. I guess it was connected to the paddle?