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Additional Pictures 

 

This Exactra 21 was manufactured in March 1975 by Texas Instruments
(Date code 095 wk 09  yr 1975).

The Exactra 21 with its 8-digit display using Chip-on-Board technology.

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, January 4, 2018. No reprints without written permission.