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HP 50g & SD Cards: Performance, Format, Notes
09-06-2016, 12:18 AM
Post: #100
RE: HP 50g & SD Cards: Performance, Format, Notes
Vtile and Claudio,

Thank you. I connected R67 to R66 and now the SD Write Protect problem is solved. And thanks to Vtile's R68 confirmation, I was able to replace that resistor with ease.

Here is a high resolution 50g PCB Photo showing SD Card Unlock Wire Fix.

I don't mind that the 50g now thinks all SD cards are unlocked. Honestly, I never would put a locked SD card in the 50g anyway.

Lastly, I know some of you spoke about "tracing to the GPIO pin" but as you can see the SAMSUNG chip is potted all around, making that job rather difficult. Since this calculator is now defunct anyway, and since HP has released other documents to the community in the past, it would certainly would be nice of them and appreciated if they would one day release the full 50g schematic for us, which obviously would be used for repair purposes, or for hobbyist use such as Claudio's newRPL. I'll send Tim Wessman a PM about it and see where it leads.

Thanks again.
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RE: HP 50g & SD Cards: Performance, Format, Notes - JDW - 09-06-2016 12:18 AM

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