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Texas Instruments TI-33

Date of introduction:	1977	Display technology:	LED-stick
New price:		Display size:	8 (5 + 2)
Size:	5.8" x 3.1" x 1.4" 148 x 78 x 36 mm³
Weight:	4.0 ounces, 114 grams	Serial No:	148362
Batteries:	BP8	Date of manufacture:	wk 48 year 1977
AC-Adapter:	AC9900/R	Origin of manufacture:	Italy
Precision:	11	Integrated circuits:	TMC0984
Logic:	Enhanced Chain
Memories:	3
Program steps:		Courtesy of:	Joerg Woerner

Funny calculator, that TI-33. This one was made for Europe and there is no equivalent on the US market. How could this happen? Long time ago, German's teacher decided that the innovative Algebraic Operating System (AOS™) logic implemented in the TI-30 is too advanced for the pupil. Texas Instruments reacted and cut out the internal memory they used for the pending operations. As a small gift the TI-33 got three memories, labeled with M1, M2 and M3. Please do not ask why you need three memories on such a basic school-calculator.

From the technical aspects the TI-33 is nothing else than a TI-30 with a different calculator chip (TMC0984 instead the TMC0981). In Europe the calculator was sold with a rechargeable battery installed, for schools a huge charging station with 20 places was available.

Simply by comparing the designation of the integrated circuits of the entry line "Majestic" calculators, you'll get the all members of this family:

• TMC0980    Goulds Pumpulator uses a custom design ROM (CD9801)
• TMC0981    TI-30 and SR-40
• TMC0982    Business Analyst and TI-41
• TMC0983    Programmer
• TMC0984    TI-33

Digging deeper into the TMC098x calculator chips you'll locate an OEM-chip used on a TI-30 "clone" manufactured in Hong Kong:

• TMC0985 Amelia Scientific 2001

View another European variant of the TI-30, the colorful TI-15. According to Texas Instruments the TI-33 was available till 1978.

AOS™ is a trademark of Texas Instruments.

If you have additions to the above article please email: joerg@datamath.org.