Another 1MB FRAM-71 Upgrade

[cruff]

I've just finished adding a second 512KB FRAM chip to my FRAM-71. For anyone else doing this, here are some hints.

1. The upper chip's pins must be bent somewhat more than 90º to make contact with the lower chip's pins.
2. Use bright lighting or you can't determine anything worth squat.
3. Use magnification - very important!
4. Flux is your friend - extremely important!
5. Make sure your soldering iron tip hot enough to be able to melt solder quickly.
6. Continuity test the results pin by pin.
7. Don't break off pin 6. Had to do some field surgery on the chip. :-)
   

I made a first pass with a head mounted magnifiers and a fine tip on my soldering iron, but it wasn't working. I had to make a second pass at it this this afternoon. This time I used my DSLR with a macro lens and remote live view mode on my lap top screen to examine the results. Here is a snap of the setup. The FRAM-71 board was clamped in the vise where the solder braid is sitting.
   

Here is a close up of the pin 6 repair. Used a small milling bit in a Dremel drill press to gain access to the buried pin.