Texas Instruments BA Real Estate

Date of introduction:  1993 Display technology:  LCD
New price:   Display size:  3 + 10 (7 + 2)
Size:  5.7" x 2.8" x 0.45"    
Weight:  2.9 ounces Serial No:  
Batteries:  2*LR44 Date of manufacture:  mth 07 year 1993
AC-Adapter:   Origin of manufacture:  Italy
Precision:  13 Integrated circuits:  Toshiba T6M51
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner

In 1993 Texas Instruments introduced a new design that replaced both the TI-68 look of the earlier TI-35X and the boxy design of the TI-30 Stat calculator.

The smooth shape together with rubber-like keys was used with 5 different calculators:

BA Real Estate Financial calculations

TI-30X  New display with 10 + 2 digits, 3 memories
TI-30X SOLAR With Anylite solar-cells
TI-35X  Adds 2-dim statistics and hex-calculations
TI-36X SOLAR  With Anylite solar-cells

BA-RE_RCI270793_PCB.jpg (109411 Byte)BA-RE_RCI270793_Back.jpg (50243 Byte)The internal construction of these calculators is identical and based on a flexible printed circuit board (Flex-PCB) for the keyboard and a Rigid-PCB for the display and calculator chip in a conventional Flat-pack housing. 

This design approach creates a lot of interconnections between the components but the calculator line was one of the most reliable designs of Texas Instruments ever.

The BA Real State does:

Quickly computes principal and interest payment amounts
Computes buyer qualification for both income and loan amount
Accepts qualifying ratio values based on local rates to computer the buyer qualifications
Calculates PITI (principal, interest, taxes, and insurance)
Computes ARMs, bi-weekly payments, Canadian mortgages
Solves time-value-of-money calculations
Generates amortization schedules with an automatic incrementing feature
Converts between nominal (NOM) and effective (EFF) interest rates
Includes 32 worksheets for use with clients and to practice calculator skills 

In 1996 the design of these calculators was changed again. View the updated BA Real Estate here.

The BA Real Estate is featured in the Texas Instruments Incorporated sales catalog CL-1233 dated 1994.


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If you have additions to the above article please email:

Joerg Woerner, December 5, 2001. No reprints without written permission.