DATAMATH CALCULATOR MUSEUM
Texas Instruments SR-50A
|Date of introduction:||March 1975||Display technology:||LED-stick|
|New price:||$109.50||Display size:||10 + 2|
|Size:|| 5.8" x 3.2" x
147 x 81 x 32 mm3
|Weight:||8.5 ounces, 240 grams||Serial No:||148641|
|Batteries:||BP1A||Date of manufacture:||wk 21 year 1976|
|AC-Adapter:||AC9130, AC9130A||Origin of manufacture:||USA (LTA)|
|Precision:||13||Integrated circuits:||TMC0501, TMC0531|
|Program steps:||Courtesy of:||Joerg Woerner|
The SR-50A was introduced shortly after the SR-50 to to reduce manufacturing costs. Later during production, probably with the introduction of the SR-56, the SR-50A was revised again. The hardware of both the SR-50A and SR-51A was redesigned to accommodate the TMC0501 Arithmetic Chip, one (SR-50A) or two TMC0530 SCOM (Scanning and Read Only Memory) Chips (SR-51A and SR-56) and none (SR-50A and SR-51A) or one TMC0599 Multi-Register Chip (SR-56).
Basically the same printed circuit board (PCB) was used with different chip populations to manufacturer 3 different calculators priced between US$ 109.50 and US$ 224.95.
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© Joerg Woerner, September 10, 2008. No reprints without written permission.