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X-ray of my HP 28S. 28 kV, 63 mAs. Not sure what the large dense circular object is, but it's something that sits under the LCD. Perhaps some epoxy covering up a chip. I'll have to try another shot with higher energy x-rays.

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A couple more x-rays of my HP 28S. 80 kV, 2 mAs. The higher energy shows some more detail through the circular object.
Thanks to a friend of mine for reminding me that the HP 28S can beep, so the large circular thing would be a piezo buzzer.

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