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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 0.9"    
Weight:  3.9 ounces Serial No:  210035
Batteries:  2*LR44 Date of manufacture:  wk 37 year 1981
AC-Adapter:   Origin of manufacture:  USA
Precision:  11 Integrated circuits:  CD4555, CD4556
Memories:  1-8    
Program steps:  56-0 Courtesy of:  Stefan Klaes
    Download manual:   (US-QR: 1.5 MByte)

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 (IC's) 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.