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ward p300Model: Montgomery Ward P300 (TXI-8663A)
Battery:  3*AA NiCd or 4*AA Alkaline

Adapter:  AC9130
Year: 1974
Chip: TMS0120, 2*SN75493, 2*SN27423
Manual:
Info:
 This Montgomery Ward P300 aka TXI-8663A could easily identified as larger brother of the P200 aka TXI-8662A and a close relative of the SR-10.