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HP 50g & SD Cards: Performance, Format, Notes
09-03-2016, 05:10 PM (This post was last modified: 09-03-2016 05:49 PM by Vtile.)
Post: #87
RE: HP 50g & SD Cards: Performance, Format, Notes
I did find an easy method to open the calculator... No need to remove the screen shield.

   

My trusty veroboard strip cutting drill bit is ultimate hacktool. Tongue

PS. The mechanism is really interesting.. It seems that it is "single pole double throw" switch or how one should describe it.. where is my multimeter and magnifying glass. R67 I assume is the WP line ??

Edit. Yes, I would look at R67. my quick proping indicates that it is in not connected with the contactor springs at the bottom part of the connector near the R68 when the card is WP. While those springs are really painfully breathles to probe as they are so sensitive to move around. The mechanism in my eyes do CD task in the bottom part and the WP part at the top part (bottom is the R68 end and TOP is where you insert the card and where the R67 is.)
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RE: HP 50g & SD Cards: Performance, Format, Notes - Vtile - 09-03-2016 05:10 PM



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