Programming Key Index  273 
 
File name: hp 12c pt_user's guide_English_HDPMF123E27  Page: 273 of 275   
Printed Date: 2005/8/1    Dimension: 14.8 cm x 21 cm 
 
Program Mode  Run Mode 
Active Keys: 
 
 
 
 
i Go to. Followed by a 
decimal point and a 
three-digit number, 
positions calculator to that 
line in program memory. 
No instructions are 
executed (page 114) 
 
Ç Single step. Displays 
line number and contents 
of next program memory 
line. If held down, 
displays line number and 
contents of all program 
memory lines, one at a 
time (page 109). 
Ü Back step. Displays 
line number and contents 
of previous program 
memory line. When back 
stepped from line 000, 
goes to end of program 
memory as defined by 
gN. If held down, 
displays line number and 
contents of all program 
memory lines, one at a 
time (page 113). 
Pressed from 
keyboard: 
t Run/Stop. Begins 
execution of a stored 
program. Stops 
execution if program is 
running (page 106). 
i Go to. Followed by 
a three-digit number, 
positions calculator to 
that line in program 
memory. No instructions 
are executed 
(page 125). 
 
Ç Single step. 
Displays line number 
and keycode of current 
program memory line 
when pressed; executes 
instruction, displays 
result, and moves to 
next line when released 
(page 114). 
Ü Back step. Displays 
line number and 
keycode of previous 
program memory line 
when pressed; displays 
original contents of 
X-register when 
released. No 
instructions are 
executed (page 116).
Any key. Pressing any 
key on the keyboard 
stops execution of a 
program (page 124)
Executed as a 
recorded program 
instruction: 
t Run/Stop. Stops 
program execution 
(page 122). 
 
i Go to. Followed by 
a three-digit number, 
causes calculator to 
branch to the specified 
line number next, and 
resumes program 
execution from there 
(page 125). 
 
u Pause. Stops 
program execution for 
about 1 second and 
displays contents of 
X-register, then resumes 
program execution 
(page 117). 
 
om 
Conditional. 
o tests number in 
X-register against that in 
Y-register. m tests 
number in X-register 
against zero. If true, 
calculator continues 
execution at next 
program memory line. 
If false, calculator skips 
next line before 
resuming execution 
(page 129)