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TI 1880 checkwriterModel: TI-1880 CheckWriter
Battery: 2 x LR43
Adapter: 
Year:  1982
Chip: TPO0311 
Info:  The TI-1880 Checkwriter combines a wallet to hold the checks, balance book, cash, credit cards and a pen with a slimline calculator. The calculator is a standard TI-1001 with brown-silver colored housing.