DATAMATH  CALCULATOR  MUSEUM

Additional Pictures 

 

 

LED Display with Chip-on-Board technology located
with an Exactra 19 calculator manufactured in
October 1974 (Date code 444 wk 44  yr 1974).

 

LED Display with single LED modules located
with an Exactra 20 calculator manufactured in
May 1974 (Date code 204 wk 20  yr 1974).

LED Display with Chip-on-Board technology located
with an Exactra 20 calculator manufactured in
August 1974 (Date code 334 wk 33  yr 1974).

 

LED Display with single LED modules located
with a TI-2000 calculator manufactured in
June 1974 (Date code 254 wk 25  yr 1974).

 

 

LED Display with single LED modules located
with an Exactra 21 calculator manufactured in
March 1974.

LED Display with Chip-on-Board technology located
with an Exactra 21 calculator manufactured in
March 1975 (Date code 095 wk 09  yr 1975).

Bowmar Opto-Stick LED Display located
with an Exactra 21 calculator manufactured in
February 1975 (Date code 055 wk 05  yr 1975).

 

 

 

 

Early Bowmar Opto-Stick LED Display located
with an Exactra 22 calculator manufactured in
October 1974 (Date code 444 wk 44  yr 1974).

 

 

 

 

Bowmar Opto-Stick LED Display located
with an Exactra 23 calculator manufactured in
November 1974 (Date code 484 wk 48  yr 1974).


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

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