This is a decap of a quartz watch control IC. There are die shots at the end of the video. Decapping doesn't have to be done using nasty acids...
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https://www.youtube.com/watch?v=jxPNGlKMGYM
This PCB is a breakout board for the FX-603P connector. It allows connections to the signals coming out of the calculator and provides 0.1" connections.
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https://www.youtube.com/watch?v=yBEwvr8qO-8
This is a Rockwell 920/3 calculator, one of the Rockwell 900 series.
Manuals on Katie Wasserman's site:
http://www.wass.net/manuals/
I'm trying to pull all the information I have on this calculator here:
https://sites.google.com/d/1V14QzSjnWO_XDMreRE1ATJx_TDg5Z-i-/p/1Mi0Xp-P4tiJmt7-axZWRxEv-ChLhPQqZ/edit
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https://www.youtube.com/watch?v=mRxRr7Xm_wA
The SP0256-AL2 is almost unobtainable, and if you can get a non-fake device then it will cost you lots. What do I do with my Psion speech adapter PCBs that I have no Is for? make an emulated IC, that's what.
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https://www.youtube.com/watch?v=njsNJoiKlUM