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.