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Additional Pictures 

 

This TI-2550 II was manufactured in February 1976 by
Texas Instruments in Lubbock, TX (Date code LTA 0976 wk 09 yr 1976).

The TI-2550 II is powered by a BP2 battery pack with 2 rechargeable AA-Size NiCd cells.

The TI-2550 II with its keyplate removed showing two sliding switches.

The printed circuit board (PCB) of the TI-2550 II is centered around a TMS1071
single-chip calculator circuit of the TMS1000 Family.

The Close-up view of the TMS1071 single-chip calculator circuit.

The Close-up view of the ITRON FG95A1 Vacuum Fluorescent Display (VFD).


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

Joerg Woerner, November 13, 2022. No reprints without written permission.