Texas Instruments TI-5225

Date of introduction:  1977 Display technology:  Fluorescent
New price:   Display size:  12
Size:  12.0" x 12.3" x 3.3" Printer technology:  Thermal TP-20225, TP-27225
Weight:  6 pounds 2 ounces Serial No:  0207647
Batteries:   Date of manufacture:  year 1977
AC-Adapter:  120 V or 220 V Origin of manufacture:  USA
Precision:  12 Integrated circuits:  TMS1312, TMS1372 (ZA0396), 3*SN96912
Memories:  1 + 1    
Program steps:   Courtesy of:  Joerg Woerner

This huge desktop printing calculator is a sibling of the neat TI-5220 based one the earlier TI-5040.

TI-5225_1.jpg (153252 Byte)Dismantling the TI-5225 reveals some known components and a typical Texas Instruments construction. The keyboard module is similar to the TI-3500 introduced already in 1972 and the printer is borrowed from the PC-100 printing cradle sold together with the SR-52.

TI-5225_PCB.jpg (155443 Byte)The printed circuit board (PCB) makes use of two enhanced devices of the famous
TMS1000 Microcomputer family. We know similar chips already from the related TI-5220, a sibling of the TI-5040. PC-100 printing cradle sold together with the SR-52 and the TMC0261 of the TI-5040.

An enhanced version of the TI-5225 was introduced with the odd TI-5230.

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If you have additions to the above article please email:

Joerg Woerner, November 17, 2003. No reprints without written permission.