HP 35s bad keyboard

[Tugdual]

many people including myself complained about the colors that require black light to be visible.
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My eyes are almost 60 years old and I can read the prime's keyboard just fine. Granted, in dim light it's a little hard to read. If you would just throw out those compact florescent bulbs and get some good ol' 100 watt incandescent bulbs, everything will be fine.
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Or have a keyboard that you can use in dimmer light, like all other calcs but the Prime.