Montgomery Ward P200 aka TXI-8662A

Date of introduction:  1974 Display technology:  LED-stick
New price:   Display size:  8
Size:  6.5" x 3.2" x 1.7"
 166 x 81 x 44 mm3
Weight:  7.5 ounces, 214 grams Serial No:  47X-016035
Batteries:  3*AA NiCd or 4*AA Alkaline Date of manufacture:  wk 33 year 1974
AC-Adapter:  AC9130 or AC9120 Origin of manufacture:  USA
Precision:   Integrated circuits:  TMS0601
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner
    Download manual:   (US: 2.8M Bytes)

The P200 could be easily identified as a close relative of the TI-2550. 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 style of the memory keys. The color of the housing is slightly different, too.

Dismantling this Montgomery Ward P200 aka TXI-8662A calculator manufactured in August 1974 reveals a well-known internal construction. The printed circuit board (PCB) is 100% identical with the first edition of the TI-2550 introduced in 1974, too.

The electronics of the P200 is centered around the TMS0601 single-chip calculator circuit, TI's second generation succeeding the famous TMS1802.

Compare it with its scientific sibbling P300.

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

The featured calculator was donated in November 2011 by Scott Brainard. Thank you!

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If you have additions to the above article please email:

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