Nov 142020
 

http://www.finetune.co.jp/~lyuka/interests/calc/pioneer/

HP Pioneer series calculator internals
Takayuki HOSODA
Nov. 17. 2009

 Japanese edition is here.


PCB of the HP pioneer series calculators


Left: HP-17BII, Center: HP-27S, Right: HP-42S(modified)

Membrane switches

 

Key pad and back plate (with LCD)

Partial schematic of the HP 17BII/27S/42S


SEE ALSO

HP 42S memory upgrade and overclock
Pioneer “Observational Internals”, Paul J. Brogger


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