Texas Instruments

• Majestic line

Model: SR-40
Battery: BP 5
Adapter: AC9132
Year: 1976
Chip: TMC0981
Manual: with permission www.datamath.org           
Info: MAJESTIC line 

• Majestic line
• Rare
• TI-30

Model: SR-40 LCD
Battery: 2 x AA
Adapter: NO
Year: 1981
Chip: TP0320
Manual:            
Info:The extremely rare SR-40 LCD (1981) calculator produced in Brazil is an interesting model, as at first glance it looks very similar to the European version of the TI-30 LCD. However, a few differences set it apart. One of the most noticeable differences concerns the keys: while the European TI-30 LCD features the **N!** (factorial) key, the Brazilian SR-40 LCD has the **x!** key, a detail that might reflect slight variations in functionality or target use. Another notable difference is the design of the battery compartment. The SR-40 LCD uses two AA batteries, but the compartment cover requires a coin to be opened, unlike the sliding cover of the European TI-30 LCD. This feature probably represents an adaptation for greater durability or security in battery replacement. These small variations between the models highlight production differences between different markets, making the SR-40 LCD a particularly rare and interesting piece for vintage calculator collectors.

Many Thnaks to DATAMATH.ORG

• Classic 1 generation

Model: SR-50
Battery: BP 1
Adapter: AC9200
Year: 1974
Chip: TMC0501 / 0521
Manual: with permission www.datamath.org
Info: TIP line -  classic first GENERATION 

• Classic 2 generation

Model: SR-50 A
Battery: BP 1 A
Adapter: AC9130
Year: 1976
Chip: TMC0501 - TMC0503
Manual: with permission www.datamath.org      
Info: classic second GENERATION 

• Classic 1 generation
• Rare
• Dismac

Model: SR-50 Dismac
Battery: BP 1
Adapter: AC9200
Year: 1974
Chip: TMC0501 / 0521
Manual:
Info: Fellow calculator collector Marie Lisa Collas surprised us in December 2015 with this unusual looking SR-50manufactured for Dismac Industrial S.A. in Brazil. Texas Instruments changed the appearance of the original dramatically by simply switching the silver colored aluminum bezel from the display frame to the keyboard. Purchased in 2022.