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Additional Pictures 

 

This Exactra 21 was manufactured in February 1975 by Texas Instruments
(Date code 055 » wk 05  yr 1975).

The Exactra 21 with its 8-digit Bowmar Opto-Stick display and costly keyboard.

The missing switch of the keyboard.

The double-sided printed circuit board (PCB) of the Exactra 21.

Close-up of the TMS0803 single-chip calculator circuit.


horizontal rule

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

© Joerg Woerner, December 30, 2017. No reprints without written permission.