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OT: Radio Shack EC-350 - Printable Version

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OT: Radio Shack EC-350 - Joerg Woerner - 04-29-2012


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.


Re: OT: Radio Shack EC-350 - Matt Agajanian - 04-29-2012

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

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

Rockwell - Frank Boehm (Germany) - 04-30-2012

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

Re: OT: Radio Shack EC-350 - Joerg Woerner - 04-30-2012

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,

Re: OT: Radio Shack EC-350 - Matt Agajanian - 04-30-2012

Thanks for the tech clarification.

Re: OT: Radio Shack EC-350 - Frank Boehm (Germany) - 04-30-2012

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 - Don Davis - 05-01-2012

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

Re: OT: Radio Shack EC-350 - Frank Boehm (Germany) - 05-02-2012

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 - Ethan Conner - 05-02-2012

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