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BA 54Model: BA-54
Battery: 2 x LR44
Adapter: 
Year: 1997
Chip:  CD4553 CD4554 
Info:  slanted LCD  generation


 

 


 

BA 55Model: BA-55
Battery: 2 x LR44
Adapter: 
Year: 1983
Chip:  CD4553 CD4554 
Info:  slanted LCD  generation


 

 


 

ba IIModel: BA-II
Battery: 2 x LR44
Adapter: 
Year: 1985
Chip:  TPO322
Info:  Business Analyst II


 

 


 

BA II plusModel: BA II plus
Battery: CR2032
Adapter: 
Year: 1996
Chip:  T6a53 Toshiba
Info: modern LCD  1991 - 1999


 

 

 


 

ba IIModel: BA-III
Battery: 2 x LR44
Adapter: 
Year: 1985
Chip:  TPO322
Info: