Texas Instruments SILCA 48

Date of introduction:  1977 Display technology:  LED-stick
New price:   Display size:  8 (5 + 2)
Size:  5.8" x 3.1" x 1.4"
 148 x 78 x 36 mm3
Weight:  4.0 ounces, 114 grams Serial No:  32964
Batteries:  9V or RK2 Date of manufacture:  wk 39 year 1977
AC-Adapter:  AC9900/R Origin of manufacture:  Italy (RCI)
Precision:  10 Integrated circuits:  TMS0981
Logic:  AOS - 4 Pending Operations, 15 ()    
Memories:  1    
Program steps:   Courtesy of:  Marie Lisa Collas

SILCA 48 calcolatrice PROFESSIONALE? Obviously a Texas Instruments TI-30 in disguise. We were really surprised to receive in December 2015 this beautiful calculator from fellow collector Marie Lisa Collas. It is obvious that this SILCA 48 - manufactured for an unknown company in Italy - is a hybrid of two different products:

The basic functionality is borrowed without any doubts from the TI-30 introduced in 1976
The yellow keyboard plate is... unique

Dismantling this model professional manufactured in 19778 reveals a standard TI-30 printed circuit board (PCB) with the well-known TMS0981 single-chip calculator circuit.

Calculator collectors: Please let us know if you have any information about this rare calculator. Thanks.

Don't miss the model professional manufactured for Koh-I-Noor Hardtmuth.

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If you have additions to the above article please email:

Joerg Woerner, May 28, 2016. No reprints without written permission.