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Opening the HP48: Addendum

Posted by David Fenyes on 20 Feb 2001, 8:31 p.m.

I left out a couple of points:

1) (Thanks to Nick Zacharopoulos) To make the reassembled calculator super-sturdy, completely remove the two plastic rivet-posts from above the display, and glue little 2-56 plastic hex nuts at their base. Drill out the portion of the posts attached to the calculator back with a small bit, large enough to pass plastic 2-56 bolts. Cut two 2-56 plastic screws just long enough to lock into the hex nuts with the case closed. Once the glue dries, close the case, and tighten down the screws. The calculator will be very solid.

2) If you plan to make your own serial cable, you may want to consider clipping off the serial connector, and soldering+epoxying a 4-pin 0.100" molex connector instead (it will fit). These are a little sturdier, and it's easy to find the female mates. I've done this and it works well. Note that unlike the other mods, this will be very evident on inspection.


Edited: 20 July 2003, 5:32 p.m.


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