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Additional Pictures 

 

This TI-2550 III (Version 1) was manufactured in September 1976 by
Texas Instruments in Lubbock, TX (Date code LTA 3776 » wk 37 yr 1976).

The TI-2550 III with its keyplate removed showing only one sliding switch.

The printed circuit board (PCB) of the TI-2550 III is centered around a TMS1043
single-chip calculator circuit based on the TMS1000 Family.

Close-up view of the TMS1043 single-chip calculator circuit.

Close-up view of the ITRON FG95B1 Vacuum Fluorescent Display (VFD).


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