Montgomery Ward P300 aka TXI-8663A 

Date of introduction:  1974 Display technology:  LED modules + lens
New price:   Display size:  8 + 2
Size:  6.3" x 3.1" x 1.5"    
Weight:  10 ounces Serial No:  47X-011706
Batteries:  3*AA NiCd Date of manufacture:  wk 50 year 1974
AC-Adapter:  AC9130 Origin of manufacture:  USA
Precision:  8 Integrated circuits:  TMS0120
Program steps:   Courtesy of:  Joerg Woerner

This Montgomery Ward P300 aka TXI-8663A could easily identified as a close relative of the SR-10

Both calculators use the same electronics, the same layout of the keyboard and even an identical mold for the housing bottom. The different look is achieved through a new mold for the upper half of the housing and a different color of the function keys. The color of the housing is slightly different, too.

Compare it with it's sibling P200 and another SR-10 clone, the Radio Shack EC-425. If you are looking for a SR-10 with blue function keys, don't miss this SR-10 Rebuilt.

Don't miss the rare TXI-8661A based on the Exactra 23 calculator.

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If you have additions to the above article please email:

Joerg Woerner, December 5, 2001. No reprints without written permission.