M-Office 28SR
Brief History
Well-known store network and company in Switzerland, Migros broadened its profile, introduced watches from 1968 and pocket calculators from 1975. With its own brand M-Office the first calculators were ordered from the Hong-Kong company who made the Santron ones and produced with altered colors. The 28SR (identical to Santron 28SR) used Texas Instruments’ circuit, and has an unusual RE key: it exchanges the two registers X and Y and performs the pending operation too.
Manufacturer: | Migros Genossenschafts-Bund (Switzerland) |
OEM: | Santron Electronics Co. Ltd. (Hong-Kong) |
OEM model: | 28SR |
Mfg. date: | 1976 |
Size: | 7,5×13,4×3,1 cm |
Weight (ready for operate): | n.a. |
Type: | four-function |
Capacity: | 8 digits (input/display) 8 digits (internal precision) |
Operating logic: | algebraic |
CPU: | Texas Instruments TMS0855NL |
Registers: | 2 standard (with saving the pending operation) 1 constant (with saving the pending operation) |
Features: | %calculation with percent +/-change sign (direct entry of negative numbers) RVexchange registers (X-Y) Ffloating-point notation Sqrsquare root |
Display: | 9 digit VFD |
Power: | 2×AA-type battery 3V adaptor |
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