We noticed these differences with the Unisonic Sharp LI3329MT and keys, display indicators right-hand side.NEC uPD1832G and keys, display indicators left-hand side.This interesting feature allows the use of the same PCB design for both "Standard" and "Checkbook" calculators.ĭon't miss the Technico LC 741CK - a "Checkbook" calculator with key.ĭesign of the APF 3552 Checkbook Balancer was used with a Sharp LI3329MT (MRC) Standard Calculator: does clear the Memory.(MR) Checkbook Calculator: doesn't clear the Memory.Inspecting the PCB of the APF 3552CK Checkbook Balancer brought our attention to two small jumpers to select between: The featured APF 3552CK manufactured in September 1982 in Taiwan reveals a clean designĬentered around an NEC uPD1832G single-chip calculator circuit soldered on a double-sided printed circuit board (PCB) and powered by TI-2200 II Checkwriter - Toshiba + Solar cells = Winning formula Find more Account Manager calculators in the Datamath NEC of Japan lost some market share with their design for Account Manager calculators in the Eighties, when competitors like Hitachi and Sharp introduced similar chips and finally lost the business completely to Toshiba's LC 262CK Check Master - Credit Card sized TI-2200 Checkwriter - Late, but not too late Royal LCB 835 - Just one Memory (uPD1831G).NS103A, switched its internals to the uPD1833G but we feature some more Account Manager calculators in the Datamath Calculator Museum based on this technology: Ĭheckbook - Missing the Toggle Key for the decimal mode Indicator (AM) Add mode with the decimal automatically put in the dollars and cents position (0.00)Įven the successor of the NS103, known as.
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