DATAMATH CALCULATOR MUSEUM
Texas Instruments TI-1050
|Date of introduction:||June 1977||Display technology:||Fluorescent|
|New price:||$12.95, £9.95||Display size:||8|
|Size:|| 5.4" x 2.8" x
138 x 72 x 32 mm3
|Weight:||3.5 ounces, 98 grams||Serial No:|
|Batteries:||9V||Date of manufacture:||wk 40 year 1977|
|AC-Adapter:||AC9180||Origin of manufacture:||USA (MTA)|
|Program steps:||Courtesy of:||Joerg Woerner|
together with the TI-1000 this one uses a fluorescent display and some enhanced
features. In a direct comparison with the TI-1025 you'll
notice the unusual [M], [MR] and [REV]-keys. At first glance you would expect
only limited memory functions and an exchange functions between the memory and
display known from the TI-2550-III but
Colin Douglas Howell located the US Patent
This patent includes a complete ROM listing of the code in the TMC0921 single-chip calculator circuit used by TI-1050. Unfortunately, the listing is rather poorly printed, but there are a couple other patents, #4100606 and #4287559, which include clearer printouts of the same code. The code, once deciphered, is rather interesting, and it serves as a useful guide to the details of both the TI-1050 and the TI-1025, which used the closely related TMC0923.
This code reveals that the TI-1050's [M] key is a prefix key that allows it to perform various memory operations, including the following:
|[M] [CE/C]||Clear Memory|
|[M] [=]||Store Display in Memory|
|[M] [+]||Add Display to Memory|
|[M] [-]||Subtract Display from Memory|
|[M] [x]||Multiply Memory by Display|
|[M] [:]||Divide Memory by Display|
|[M] [REV||Exchange Memory with Display|
The approach of a memory prefix key was continued with the TI-1680, its twin TMS-2550-IV and the later TI-1070.
The TI-1050 calculators were manufactured either in El Salvador, Hong Kong, Italy or USA.
Calculators with different keyplates were sold from Western Auto as Citation and Koh-i-Noor Hardtmuth as TI-1050.
If you have additions to the above article please email: firstname.lastname@example.org.
© Joerg Woerner, December 5, 2001. No reprints without written permission.