Table: calculator_specs
Columns: calculator
cpu
ram
display_size
programming_languages
link_abilities
year_released
predecessors
successors

Question: What is the link abilities when the predecessors is ti-85?
SQL: SELECT "link_abilities" FROM calculator_specs WHERE "predecessors" = 'TI-85'

Question: What is the cpu of the calculator released in 1993?
SQL: SELECT "cpu" FROM calculator_specs WHERE "year_released" = '1993'

Question: what is the display size for the calculator released in 1997?
SQL: SELECT "display_size" FROM calculator_specs WHERE "year_released" = '1997'

Question: what is the display size for the calculator ti-82?
SQL: SELECT "display_size" FROM calculator_specs WHERE "calculator" = 'TI-82'

Question: what is the cpu for the calculator with 28 kb of ram and display size 128×64 pixels 21×8 characters?
SQL: SELECT "cpu" FROM calculator_specs WHERE "ram" = '28 KB of RAM' AND "display_size" = '128×64 pixels 21×8 characters'