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HP Forum Archive 21

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OT: Radio Shack EC-350
Message #1 Posted by Joerg Woerner on 29 Apr 2012, 7:07 p.m.

Folks,

Any idea who manufactured this cutie? It is made in the US, features a Western Digital calculator chip and is somehow similiar to some Texas Instruments OEM products (think Montgomery Ward P8M).

Any ideas / hints welcome.

Regards, Joerg

      
Re: OT: Radio Shack EC-350
Message #2 Posted by Matt Agajanian on 29 Apr 2012, 9:27 p.m.,
in response to message #1 by Joerg Woerner

From the design of it, the slanted display and the label placement, my instinct tells me maybe it's a dupe of a Litronix made for RS.

Edited: 29 Apr 2012, 9:43 p.m.

            
Re: OT: Radio Shack EC-350
Message #3 Posted by Don Davis on 1 May 2012, 6:07 a.m.,
in response to message #2 by Matt Agajanian

I had one of those, and I am not sure of the manufacturer - but I seem to recall Bowman having similar models and I thought it was perhaps theirs. Not at all certain though. Don

      
Rockwell
Message #4 Posted by Frank Boehm (Germany) on 30 Apr 2012, 6:48 a.m.,
in response to message #1 by Joerg Woerner

But mine use NS chips (CPU&driver), maybe there are different versions, or the CPUs are interchangeable

      
Re: OT: Radio Shack EC-350
Message #5 Posted by Joerg Woerner on 30 Apr 2012, 7:41 a.m.,
in response to message #1 by Joerg Woerner

Litronix manufactured usually in Malaysia, the keyboard is completely different and the display isn't from Litronix.

The CPU is a 40-pin DIP and Rockwell manufactured usually in Mexico. Rockwell keyboard designs are differnt from this one...

Very strange calculator.

Thanks and Regards, Joerg

            
Re: OT: Radio Shack EC-350
Message #6 Posted by Matt Agajanian on 30 Apr 2012, 10:04 a.m.,
in response to message #5 by Joerg Woerner

Thanks for the tech clarification.

            
Re: OT: Radio Shack EC-350
Message #7 Posted by Frank Boehm (Germany) on 30 Apr 2012, 11:30 a.m.,
in response to message #5 by Joerg Woerner

I noted "Manufactured by Rockwell" in my list, probably not without a reason :)
You might want to check for PCB marks, maybe there is the /|\ logo somewhere to be found...

                  
Re: OT: Radio Shack EC-350
Message #8 Posted by Frank Boehm (Germany) on 2 May 2012, 10:45 a.m.,
in response to message #7 by Frank Boehm (Germany)

So I just disassembled one, and on second sight, I don't think it is manufactured by Rockwell (odd that I added this as a hint).
I found an "ASSY 10xxxxx" only on the PCB and a moulding sign "E.M.C.".
Maybe it has been manufactured by TI after all, though the lettering of the serial number sticker might hint at Bowmar as well.
The manual hints at Fort Worth, so no clue there either.

                        
Re: OT: Radio Shack EC-350
Message #9 Posted by Ethan Conner on 2 May 2012, 11:46 a.m.,
in response to message #8 by Frank Boehm (Germany)

Fort Worth being the corporate headquarters for (at the time) Tandy corporation/Radio Shack. This is now just Radio Shack.


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