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Texas Instruments TI-2550 (2nd design)

Date of introduction:  1975 Display technology:  LED-stick
New price:  $99.95 Display size:  8
Size:  6.5" x 3.2" x 1.8"
 165 x 80 x 45 mm3
   
Weight:  7.8 ounces, 220 grams Serial No:  2550391520
Batteries:  3*AA NiCd or 4*AA Alkaline Date of manufacture:  wk 18 year 1975
AC-Adapter:  AC9130 or AC9120 Origin of manufacture:  USA
Precision:   Integrated circuits:  TMS0601
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner
    Download manual:   (US: 1.8 MByte)

TI-2550_PCBB.jpg (140536 Byte)TI-2550_Back.jpg (266412 Byte)The only difference between the original TI-2550 and this later model is the LED (Light Emitting Diodes) display. The original design used the Opto-stick display manufactured by Bowmar, the later models carried a Texas Instruments LED-stick with magnifier lenses.

The electronics of the TI-2550 is centered around a Texas Instruments TMS0601 single-chip calculator circuit.

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

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