tions. These variables are always available for use. For exam-
ple, in ALG mode, to save the currently displayed value into
register Q, press ºeQÏ. To recall the value to use it
again, press hQÏ. The stack registers X, Y, Z, and T
are not the same as the memory registers with the same letter.
For example, ºeT stores a number into variable T, not
stack register T. The w function does not swap the values of
the data registers X and Y but swaps stack registers X and Y.
Memory is allocated to registers indirectly addressed. Reference
these indirect registers by storing the numeric address desired
into variable I or J and use the special functions ºe7 or
ºeA to store a value indirectly. For example, in ALG
mode, to store a future result into indirect register 3 using regis-
ter J, first store 3 into J by pressing 3ºeJÏ, com-
pute the value to store and press ºeAÏ. If J still
holds 3, pressing hA Ï recalls the value later for use.
Some of the many built-in functions are listed in Table 3.
Getting Started 15