Texas Instruments TI-55-II Prototype

Date of introduction:  1981 Display technology:  LCD
New price:  $40.00 Display size:  8 + 2
Size:  5.8" x 3.1" x 0.90"
 147 x 79 x 23 mm3
Weight:  3.7 ounces, 106 grams Serial No:  210035
Batteries:  2*LR44 Date of manufacture:  wk 37 year 1981
AC-Adapter:   Origin of manufacture:  USA
Precision:  11 Integrated circuits:  TP0456/CD4555, CD4556
Memories:  1-8    
Program steps:  56-0 Courtesy of:  Stefan Klaes
    Download manual:   (US-QR: 1.5M Bytes)

This early prototype of the TI-55-II sports two differences to the later series model:

The display frame is much darker.
The two Integrated Circuits (ICs) look not very professional.

TI-55-II_Proto_PCB.jpg (51643 Byte)

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Joerg Woerner, November 10, 2004. No reprints without written permission.