DATAMATH CALCULATOR MUSEUM
Texas Instruments TI-58C Pool Water Analysis
|Date of introduction:||1979||Display technology:||LED-stick|
|New price:||Display size:||10 (8 + 2)|
|Size:|| 6.4" x 3.2" x
162 x 81 x 37 mm3
|Weight:||8.5 ounces, 240 grams||Serial No:||7183855|
|Batteries:||BP1A||Date of manufacture:||wk 17 year 1979|
|AC-Adapter:||AC9131||Origin of manufacture:||USA (ATA)|
|Precision:||13||Integrated circuits:||TMC0501E, TMC0591, CD2400, CD2401 TMC0573|
|Program steps:||480-0||Courtesy of:||Mark Bollman|
main disadvantage of the TI-58, the non-permanent
program storage was corrected with the TI-58C. Using a low-power C-MOS memory (an
unknown chip in this machine) battery drop caused by the NiCd's itself was
quicker than drop caused by the memory.
The TI-58C continued the usage of the Solid State Software Modules™ with up to 5000 program steps introduced with the TI-58 and TI-59 already in 1977. On the backside of the TI-58/59 you'll notice a small lid with a place for a module. The Master Library with 25 different programs was included, a lot of other modules were available.
We know five different approaches of the module expansion:
|Standard modules like the Master Library use only the small
the A,B,C,D, and E keys.
|Other modules like this Pool Water Analysis developed by
make use of a colorful keyboard mask.
|Customized calculators like the USMC
AV-8C calculator or insurance calculators|
sold by Allianz and others use special keyboard arrangements.
|The CAL-Q-TAX calculator uses an extender instead the usual drop-in modules.|
|The Kodak Q-700 Program
Adapter makes use of a snap-on cover with an|
the Pool Water Analysis calculator reveals a standard TI-58C
calculator manufactured in Spring 1979. It is one of the very early models, the
printed circuit board (PCB) of the calculator was manufactured in Canada and
makes use of some blue wires.
The calculator was available till the year 1983.
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© Joerg Woerner, October 1, 2002. No reprints without written permission.