HP48GX RAM card design
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01-21-2021, 06:27 AM
Post: #19
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RE: HP48GX RAM card design
(01-19-2021 12:54 AM)wan Wrote:(01-18-2021 03:09 PM)Eric Rechlin Wrote: The connector on the edge of my RAM cards is actually 2.0 mm thick, with the total card thickness being about 2.5 mm, so I would think a better approach would be to start with something approximately like what you did (a 0.6 mm board with the gold fingers flipped to the other side), and then add a second bare 1.2 mm board glued to the top, with holes for the components to go through it, to add thickness (for the edge connector) and provide some protection for the components on the board. How you manage to change the battery? It should be changed with card installed in calculator, if I remember correctly, in order to avoid memory clear. In the original design the battery is located on top side (the one accessible when card is installed ). Cynox design is similar. |
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