Texas Instruments

• Majestic line

Model: Goulds Pumpulator
Battery: 9 volt o
Adapter: AC9132
Year: 1980
Chip: TMC0980 (CD9801)         
Info: MAJESTIC line 
Manual: with permission www.datamath.org

• Overhead

Model: Intermediate plus overhead
Battery: 
Adapter: 
Year: 
Chip:  made in China
Info:  The California based company Stokes Publishing Company, Inc. distributes under the label "The Educator®"
calculators optimized for teaching purposes. William T. Stokes filed already July 30, 1991 the US Patent Application U.S. Pat. No. 5,035,502
 with the title "Transparent calculator for overhead projection".

• Jeppesen line

Model: Jeppesen Avstar 1980
Battery: 2 x LR44
Adapter: 
Year: 1980
Chip:  TPO328
Info: JEPPESSEN  line   

• Jeppesen line

Model: Jeppesen Avstar 1986
Battery: 2 x LR44
Adapter: 
Year: 1986
Chip:  TPO328
Info: JEPPESSEN  line

• Jeppesen line

Model: Jeppesen Prostar
Battery: 2 x LR44
Adapter: 
Year: 1983
Chip:  CD4575 - CD4576
Info: JEPPESEN  line