Texas Instruments The MBA

Date of introduction:  August 1977 Display technology:  LED-stick
New price:  $79.95
 $60.00 (October, 1981)
Display size:  10 (8 + 2)
Size:  5.8" x 3.1" x 1.4"
 148 x 78 x 36 mm3
Weight:  4.0 ounces, 114 grams Serial No:  3013642
Batteries:  BP7 Date of manufacture:  wk 27 year 1981
AC-Adapter:  AC9132 Origin of manufacture:  USA (ATA)
Precision:  11 Integrated circuits:  TMC1502
Logic:  AOS - 4 Pending Operations, 15 ()    
Memories:  8-12    
Program steps:  32-0 Courtesy of:  Joerg Woerner
Download leaflet:   (US: 2.1M Bytes) Download manual:   (US: 8.5M Bytes)

MBA_ATA2781_Back.jpg (289768 Byte)The relation between a SR-40 and the TI-55 could easily be found with the Business Analyst and The MBA. Both the TI-55 and The MBA use a 12-digit LED-stick and a single-chip design and the mechanical ON/OFF slider. 
The MBA gave you advanced financial and statistical functions and targeted the market above the Business Analyst. The brown housing gave the calculator a very exclusive note.

MBA_ATA2781_PCB.jpg (71857 Byte)Simply by comparing the designation of the integrated circuits of the upper line "Majestic" calculators, you'll get the all members of this family:

TMC1501    TI-57 
TMC1502    The MBA
TMC1503    TI-55

In Europe the calculator was sold under a different name, the TI-42 MBA. Don't miss a rare Money Manager manufactured in Brazil sporting a similar brown housing. 


The "The MBA" is featured in the Texas Instruments Incorporated bulletin CL-293A dated 1978.

Find here an excerpt from the Texas Instruments Incorporated leaflet CL-199J dated 1981:


Powerful business calculator with statistical and financial functions…and programmability.

Pre-programmed functions computer net present value and internal rate of return for variable cash flows. Payment, present value, future value, number of periodic interest rate for ordinary annuities and annuities due. Bond yields and much more.
Statistical functions – mean variance, standard deviation – at the touch of a key. Plus built-in linear regression with correlation coefficient. Twelve memories.
Simple programmability lets remember a sequence of up to 32 keystrokes.
Calculator Analysis for Business and Finance. Shows you how to analyze financial situations faster, and use statistical methods easily.

© Texas Instruments, 1981


horizontal rule

If you have additions to the above article please email:

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