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Mondimat
ESR-83
1977
ABM
diamant 7003
1976

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

M-Office 28SR

Inside of the 28SR

Keyboard of the 28SR
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