CASIO fx-4100P Scientific Calculator from 1991

[jebem]

Another small pocket programmable scientific calculator from CASIO.
This one was assembled after 1991 week 14, according to the SoC date code.




Japanese industrial design with attention to detail.
Color reverse painting labeling, like Japanese used to do on pocket transistor radios from the 60's and 70's, many of them manufactured to be sold with American branding.




Opening the case is done by undoing five small screws.
To remove the case I had to use a plastic pry tool to release the lateral latches before lifting the bottom side in order to be able to slide it down to release the top side.




Unusual CASIO choice of a SoC from Toshiba, T9949A, 9114H, Japan.
Same remark for the large back cover copper shield, absent on most of CASIO machines from these series and era.




While I prefer the independent plastic keys approach like used in the fx-3600P, this rubber membrane key set is working fine and the labeling is resistant to wear; even after a vigorous cleaning with hand dish wash detergent in warm water, it retained the full paint and color.