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Additional Pictures 

 

The PCB (side A) of the TI-2500 V1:
TMS0119 Calculator Chip
2 + 2 Display Drivers
2 LED Modules


(ID: A001204, Italy)

The bottom shell of the TI-2500 V1.




The PCB (side A) of the TI-2500 V2:
TMS0119 Calculator Chip
2 + 2 Display Drivers
2 LED Modules


(ID: 2500 378664, USA)
 

The PCB (side A) of the TI-2500 V3.




The PCB (side B) of the TI-2500 V3:
TMS0119 Calculator Chip
2 + 2 Display Drivers
9 LED Modules


(ID: 2500 024221, USA
The PCB (side A) of an early TI-2510:
PCB Designation 30614E




The PCB (side B) of an early TI-2510:
TMS0119 Calculator Chip
SN27720 Power Supply
2 + 2 Display Drivers
9 LED Modules


(ID: 2510 065153, USA
 




The PCB (side B) of a rare TI-2500B
prototype
testing the Bowmar 
Opto-stick display in a TI-2500 V3.


(ID: none, wk 42 year 1973)
 




The PCB (side B) of the TI-2500B:
TMS0119 Calculator Chip
2 + 2 Display Drivers
Bowmar Opto-stick
9 LED Modules


(ID: 2500B487035, USA)
The PCB (side A) of the TI-2500 II:




The PCB (side B) of the TI-2500 II:
TMS0803 Calculator Chip
1 Display Driver
1 LED stick


(ID: 2500-II-276954, wk 33 year 1975)


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

Joerg Woerner, October 29, 2009. No reprints without written permission.