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HP-21S modified?
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11-15-2016, 09:32 PM
(This post was last modified: 11-15-2016 09:35 PM by PANAMATIK.)
Post: #1
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HP-21S modified?
I saw this image of an HP-21S battery compartment and wonder, whether the visible printed circuit board inside is original? Does anybody know what kind of modification it could be? Should I keep my hands off?
Bernhard That's one small step for a man - one giant leap for mankind. |
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HP-21S modified? - PANAMATIK - 11-15-2016 09:32 PM
RE: HP-21S modified? - Maximilian Hohmann - 11-15-2016, 09:45 PM
RE: HP-21S modified? - PANAMATIK - 11-15-2016, 09:53 PM
RE: HP-21S modified? - jebem - 11-16-2016, 01:16 PM
RE: HP-21S modified? - Maximilian Hohmann - 11-16-2016, 04:29 PM
RE: HP-21S modified? - jebem - 11-16-2016, 05:28 PM
RE: HP-21S modified? - ElectroDuende - 11-20-2016, 08:27 PM
RE: HP-21S modified? - Christoph Giesselink - 11-21-2016, 07:23 PM
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