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The TI-84+ uses a TI REF 84PLUSB (or variant) ASIC that has a Z80-compatible core in it, not a Zilog Z80, and, as you say, definitely not a DIP40 part. See the
by codebje 6mo ago
The TI-84+ uses a TI REF 84PLUSB (or variant) ASIC that has a Z80-compatible core in it, not a Zilog Z80, and, as you say, definitely not a DIP40 part.
See the ASIC here, in what looks to me like a QFP-144 package:
https://guide-images.cdn.ifixit.com/igi/e25cVO2avPxiMoXl.huge https://guide-images.cdn.ifixit.com/igi/e25cVO2avPxiMoXl.hug...
The CE also uses an ASIC, but with an eZ80 core instead.
- emptybits 6mo agoThank you! I had a job coding Z80 assembly "back in the day" and grew to love its instruction set so I'm not surprised there is legacy and value to keep stuffing wee Z80ish cores into modern devices. I also found this gem just now: http://datamath.org/Album_Graph.htm http://datamath.org/Album_Graph.htm