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HP-71B Changing Lower and Upper Halves
03-23-2018, 10:20 PM (This post was last modified: 03-23-2018 10:31 PM by Dave Frederickson.)
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RE: HP-71B Changing Lower and Upper Halves
(03-23-2018 09:31 PM)MikeSD Wrote:  Here are two different plastic back boards. Much different.

Actually, some of the via patterns look similar. Looks like the top board is multilayer with a ground plane and probably a VCC plane. Can we see a pic of the other side?

Thanks,
Dave
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RE: HP-71B Changing Lower and Upper Halves - Dave Frederickson - 03-23-2018 10:20 PM



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