1. TI-1000. The foundation of this line.
2. TI-1001. An early LCD machine dropped into the 1000 sequence.
3. TI-1025. TI-1000 enhanced with memory. Unusual green LED display.
1. TI-1050: A slightly rarer member of the 1000 series.
3. Electronic Wizard: Manufactured by TI, this 1200 clone was distributed by Western Auto.
These two calculators were manufactured by TI and sold through True Value hardware stores. The T-1220 is a TI-1200 clone; the T-1225 duplicates the TI-1250.
1. TI-1250: Full memory and a change sign key.
2. Concept II: This was marketed by TI and looks like a close relative of the 1250.
1. TI-1265: Unusual blue LED display on this one.
2. TI-1270: Orange faceplate was designed to appeal to the educational market.
1. TI-1500: Unique design for TI calculators with chrome borders.
2. TI-1750: The first LCD calculator from TI.
3. TI-1776/Spirit of '76: A 1200-series clone developed to commemorate America's bicentennial.