HP 48gII - Manual (Page 649)

Page 20-7
in the second display line. Pressing for „Ì C for this example, you
should recover the PLOT menu as follows:
If you have more than one user-defined key and want to operate more than
one of them at a time, you can lock the keyboard in USER mode by entering
„М„М before pressing the user-defined keys. With the keyboard
locked in USER mode, the specification USR will be shown in the second
display line. To unlock the keyboard press
„Ì once more.
Un-assigning a user-defined key
To remove the assignment performed above, use function DELKEYS, as follows:
ALG mode:
DELKEYS(13.0)
RPN mode: 13.0 ` DELKEYS `
Assigning multiple user-defined keys
The simplest way to assign several user-defined is to provide a list of
commands and key specifications. For example, suppose that we assign the
three trigonometric functions (SIN, COS, TAN) and the three hyperbolic
functions (SINH, COSH, TANH) to keys
A through F, respectively, as
user-defined keys. In RPN mode use:
{SIN,11.0,COS,12.0,TAN,13.0,SINH,14.0,COSH,15.0,T
ANH,16.0} ` STOKEYS `
In ALG mode use:
STOKEYS({"SIN(' ,11.0, "COS(", 12.0, "TAN(", 13.0,
"SINH(", 14.0, "COSH(", 15.0, "TANH(", 16.0}) `
Operate these keys by using, for example, in RPN mode:
5„ÌA 4„ÌB 6„ÌC
2 „ÌD 1„ÌE 2„ÌF
To un-assign all user-defined keys use:
ALG mode: DELKEYS(0) RPN mode: 0 DELKEYS
Check that the user-key definitions were removed by using function RCLKEYS.