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From: jthornto@fs1.ee.ubc.ca (THORNTON JOHAN A)
Newsgroups: comp.sys.handhelds
Subject: Re: Taking a 28C apart
Message-ID: <1300@fs1.ee.ubc.ca>
Date: 4 Jul 90 09:49:43 GMT
References: <6075@hydra.Helsinki.FI> <25590026@hpcvra.CV.HP.COM>
Sender: root@fs1.ee.ubc.ca
Reply-To: jthornto@fs1.ee.ubc.ca (THORNTON JOHAN A)
Organization: Dept. of Electrical Engineering University of B.C.
Lines: 24

I took my 28S apart shortly before I got my 48SX.  (Yeah, I'm an HP 
junkie...)

Inside are some discrete components and two noticably blank pieces of
raw metal.  A techie had the opinion that they were the actual silicon
blocks that the circuit is etched on.  I suspect that one is the Saturn
processor and the other is the ROM.  therellllThere



Also was a surface mount 64K by 
4 bit RAM.

If you really want to take one apart, peel off the metal plate over the
display and the keyboard overlay.  You will see roughly 50 "plastic
welds".  Take a 1/16" or so drill and carefully drill out each of these
bonds.  When they're all gone, the front panel pops off easily.
 
When you're finished looking, reassemble the different parts and use a 
small soldering pencil to re-weld the joints.  If you don't do this part
right the keyboard will be really loose;.  I had to open mine again to redo
it.  

.