DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Texas Instruments TI-5310
| Date of introduction: | 1983 | Display technology: | Fluorescent |
| New price: | Display size: | 12 | |
| Size: | 11.3" x 9.0" x 2.4" | Printer technology: | Impact |
| Weight: | 3 pounds 4 ounces | Serial No: | 106214 |
| Batteries: | Date of manufacture: | mth 08 year 1983 | |
| AC-Adapter: | 120 V | Origin of manufacture: | Japan |
| Precision: | 12 | Integrated circuits: | NEC uPD7519G-055 |
| Memories: | 1 + 1 | ||
| Program steps: | Courtesy of: | Joerg Woerner | |
| Download manual: | 
(US-QR: 0.8 MByte) |
The
TI-5310 Business Manager is unique within the desktop printing calculator line
of Texas Instruments. It added to a standard calculator like the TI-5142
III a whole set of financial functions. They include:
| • Cost-Sell-Margin Calculations • Compound Interest Solving • Annuities Calculations • Mortgage Payment Calculations • Payment Schedule Calculations |
Nevertheless
the financial operations could be performed really intuitive, Texas Instruments
added a convenient accessible Quick-Reference Guide to the calculator. It is
covered by a small hood near the display.
We
know only few financial desktop calculators from Texas Instruments, the
non-printing BA-20 and the printing BA-45 Micro Business Manager. But only this TI-5310 performs calculations
with 12-digit capability.
As
usual with rare calculators we dismantle the TI-5310 to reveal his genes. Just
removing the top part of the housing gives access to a well know construction.
It is typical for a Japanese calculator:
Only few components fitted directly in the bottom shell of the housing.
The
printed circuit board (PCB) of a calculator usually carries some designations of
the manufacturer. But this TI-5310 tries to keep his secrets. The board holds a
NEC uPD7519G integrated circuit, a 4-bit microcontroller of the uPD7500 series
discovered already in the BA-45. Everything else looks common.
During
clean-up of the housing parts we noticed another, very important detail of the
calculator. It was tested according to the UL Standards common in the United
States. And just this little logo on the nameplate spills out the secret! Every
company submitting a product to Underwriters Laboratories Inc. (UL) receives an
UL-File Number like E12345. Driven by the wide usage of the Internet the www.ul.com
website provides the service of online access to the UL Certification
Information.
Just try out the UL-File Number E42662
printed below the UL-Logo and you'll get important informations:
 |
|
QAOT.E42662
|
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| E42662 | |
| Electronic calculators
Models |
|
Reprinted from the Online Certifications Directory with
permission from Underwriters Laboratories Inc.
Copyright © 2003 Underwriters
Laboratories Inc.®
To be honest, this was NOT the information we expected. In other words: A whole line of desktop calculators in the timeframe between 1981 and 1989 was manufactured by Toshiba TEC Corp. We found already with the plain calculators like the TI-1750 and TI-25 introduced in 1977 and 1978 the genes of Toshiba. Just compare some Toshiba - Texas Instruments siblings here.
Curious about the sources of some other Texas Instruments desktop calculators ? Visit the UL Listed directory.
This
mark is a registered trademark of Underwriters Laboratories Inc.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, November 9, 2003. No reprints without written permission.