A RS232 TTL adapter for Vintage FX Casio Calculators and other devices – A BIT OF MYSTERY
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Old calculators
Amazon.com: Casio BF-850-N Financial Calculator, Compatible with Recurring Payments and Debit Calculations, Just Type : Office Products
Casio FX-850P
Casio FX880P: Custom Screen Characters — richard lewis
USB-Interface connected to CASIO FX-850P | USB-Interface con… | Flickr
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