HP 33s - Manual (Page 58)

3–2 Storing Data into Variables
Each black letter is associated with a key and a unique variable. The letter keys
are automatically active when needed. (The A..Z annunciator in the display
confirms this.)
Note that the variables, X, Y, Z and T are different storage locations from the
X–register, Y–register, Z–register, and T–register in the stack.
Storing and Recalling Numbers
Numbers are stored into and recalled from lettered variables with the I (store)
and L (recall) functions.
To store a copy of a displayed number (X–register) to a variable:
Press I letter–key.
To recall a copy of a number from a variable to the display:
Press L letter–key.
Example: Storing Numbers.
Store Avogadro's number (approximately 6.0221 × 10 23
) in A.
Keys: Display: Description:
6.0221 a 23 )
  _ Avogadro's number.
I
! _ Prompts for variable.
A (hold  key) !  Displays function as long as key is
held down.
(release) )
   Stores a copy of Avogadro's
number in A. This also terminates
digit entry (no cursor present).
‡
)
 Clears the number in the display.
L
_ Prompts for variable.
A )
   Copies Avogadro's number from A
the display.