Nov 142020

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


HP 42S memory upgrade and overclock
Pioneer “Observational Internals”, Paul J. Brogger [Mail]  Copyright (c) HOSODA Takayuki. All rights reserved.
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