Model: Montgomery Ward P200 (TXI-8662A)
Battery: 3*AA NiCd or 4*AA Alkaline
Adapter: AC9130 or AC9120
Info: 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.