Texas Instruments TI-150

Date of introduction:  December 1974 Display technology:  Panaplex
New price:   Display size:  8
Size:  6.5" x 3.2" x 1.8"    
Weight:  10 ounces Serial No:  150-007486
Batteries:  4*AA NiCd Date of manufacture:  wk 04 year 1975
AC-Adapter:  AC9150 Origin of manufacture:  USA
Precision:  8 Integrated circuits:  TMS0852
Program steps:   Courtesy of:  Cleo McCall
    Download manual:   (US: 2.3 MByte)

The TI-150 looks on the first view very familiar to us collectors of early calculators manufactured by Texas Instruments. It combines the wedge shape of the TI-2550 with the silver trim around the display of the SR-10. The display seems to be a miniaturized Panaplex known from the desktops like the TI-3500

The TMS0852 calculator circuit found its way with slightly modifications into the Canon Palmtronic LD-series. Don't miss the LD-80.

How rare is the TI-150 ?

This is the most important question - the calculators seems to be pretty rare. (Rumors told us that only 4000 TI-150's were produced !)

Thomas Brockmeier donated some pictures and this gives us the opportunity to understand easily how rare this calculator really is. Just take your time and watch the next six pictures carefully.

The side view demonstrates that the TI-150 uses the same mold as the TI-2550. The only difference is the color of the parts. The TI-2550 uses light grey parts instead of these black molds. TI-150_5.jpg (21252 Byte)
The backside demonstrates that even the battery compartments is identical to the TI-2550. Please notice the leading zeroes of the serial number. Perfect circumstances for high production numbers. TI-150_4.jpg (38036 Byte)
The printed circuit board of the keyboards shows the missing memory keys of the TI-2550. The key positions are identical to the sister model. TI-150_3.jpg (49109 Byte)
This inside view gives you some details of the main electronics. The display is a miniaturized Panaplex gas-discharge unit using a molded display frame. The calculator chip was used only for the TI-150, same is true for the power adapter/charger. TI-150_2.jpg (50836 Byte)
Each of the above pictures makes clear that this calculator was prepared for mass production ! But compare the box of the TI-150 with the box of the rare SR-16. They didn't finished the design of the box before market introduction !
This is really a rare calculator.
TI-150_6.jpg (67313 Byte)
What happened ? The TI-150 was simply a wrong calculator at the wrong time !
The introduction time was too late for an expensive calculator without memory. Just four month later the TI-1200 with a fraction of manufacturing costs appeared and killed the TI-150 immediately.
TI-1200.jpg (33495 Byte)



Known serial numbers:

001148, 004258, 004693 (Ken Meine), 004862 (Christa J. Anderson), 005920, 006953, 007108, 007189 (Ken Meeks), 007486, 007901, 008085 (Scott Reynolds), 008428, 009235 (Scott Reynolds), 009342, 009359, 009629 (Scott Reynolds), 009649 (Scott Reynolds), 009814 (eBay highdesertstamps), 011257, 011326, 011821, 016262 (Brendon Loyd), 016297 (eBay mu89stang3), 017013 (eBay monkeynomad23), 017800 (Scott Reynolds).

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If you have additions to the above article please email:

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