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montgomery p200Model: Montgomery Ward P200 (TXI-8662A)
Battery:  3*AA NiCd or 4*AA Alkaline

Adapter:  AC9130 or AC9120
Year: 1974
Chip: TMS0601
Manual:
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. 

montgomery p8mModel: Montgomery Ward P8M (TXI-8646A)
Battery:  4 x AA

Adapter:  
Year: 1974
Chip: TMS0601
Manual:
Info:

montgomery p8pModel: Montgomery Ward P8P (TXI-8645A)
Battery:  4 x AA

Adapter:  
Year: 1978
Chip: TMS0128
Manual:
Info: