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HP42S with non-volatile ram
09-29-2020, 09:48 AM
Post: #8
RE: HP42S with non-volatile ram
Thank you, I didn't know that HP's convention for parts placement. I searched for the 1-pin mark in and around the protective frame and die, but couldn't find it.
Also, your keypad connection diagram helped me verify the schematic I drew. Thank you again.

If you can give me a connection diagram of the LCD part omitted in my schematic, I think it's a good idea to merge it and contribute here.
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Messages In This Thread
HP42S with non-volatile ram - GreyUser - 06-11-2020, 04:40 AM
RE: HP42S with non-volatile ram - mfleming - 06-11-2020, 02:26 PM
RE: HP42S with non-volatile ram - lyuka - 09-26-2020, 12:12 PM
RE: HP42S with non-volatile ram - GreyUser - 09-28-2020, 02:41 AM
RE: HP42S with non-volatile ram - lyuka - 09-28-2020, 01:13 PM
RE: HP42S with non-volatile ram - GreyUser - 09-29-2020, 01:41 AM
RE: HP42S with non-volatile ram - lyuka - 09-29-2020 09:48 AM
RE: HP42S with non-volatile ram - lyuka - 11-17-2020, 06:11 PM



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