Re: HP28S production years? Message #6 Posted by James M. Prange (Michigan) on 22 Sept 2006, 9:55 a.m., in response to message #5 by GE
Yes, it could be a prototype; maybe a leftover circuit board with an old 1BB RAM stuck into a 28S case? How much RAM does it have? How does the lettering above the keys compare with the Museum photographs?
Also, on the back, near the serial number, my 28C has that weird symbol to the left, and "COMPLIES WITH THE LIMITS FOR A CLASS B COMPUTING DEVICE PURSUANT TO SUBPART J OF PART 15 OF FCC RULES" "ATI conforms classe B" "MADE IN USA".
On my 28S, the strange symbol is to the right, and the text is just "(c) HEWLETT-PACKARD CO. 1986" "MADE IN USA".
Regards, James
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