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:||36080|
|Batteries:||BP1A||Date of manufacture:||wk 25 year 1975|
|AC-Adapter:||AC9130, AC9130A||Origin of manufacture:||USA|
|Precision:||13||Integrated circuits:||TMC0501, TMC0521|
|Program steps:||Courtesy of:||Joerg Woerner|
|Download leaflet:||Download manual:||(US: 7.7M Bytes)|
The SR-50A was introduced shortly after the SR-50 to to reduce manufacturing costs. The only advantage compared to early SR-50 calculators is the higher calculating precision. Please find the comparison in the Calculator forensics.
The hardware of the SR-50A uses the TMC0501 Arithmetic Chip with an accuracy of 13 digits and the TMC0521 SCOM (Scanning and Read Only Memory) Chip containing 1k*13 Bits instruction memory and 16*16 digits constants.
Read more about the differences between the SR-50/SR-51 and
their successors on the SR-51A page. A low-cost version
of the SR-50A was developed but never introduced to the market. Read more about
the rare SR-40 prototype.
The appearance of the SR-50A is similar to the later SR-52 and SR-56 calculators.
With the introduction of the SR-56 in Spring 1976 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 Chips (SR-51A and SR-56) and none (SR-50A and SR-51A) or one TMC0599 Multi-Register Chip (SR-56). Read more about the revised SR-50A.
If you have additions to the above article please email: firstname.lastname@example.org.
© Joerg Woerner, December 5, 2001. No reprints without written permission.