DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
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 |
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| 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!
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, December 5, 2001. No reprints without written permission.