60 Section 5: Programming Basics
This indicates that the key for the instruction in program line 08 is in the fourth
row on the keyboard and is the tenth key in that row: the + key. When you
keyed the digit 3 into program memory, the keycode displayed was only the
digit 3.
Since keystroke sequences beginning with ´, O, l, and t are
stored in only one program line, the display of that line would show the
keycodes for all the keys in the keystroke sequence.
Displaying Program Lines
Pressing ¥ to set the calculator from Run mode to Program mode displays
the line number and keycode for the program line to which the calculator is
currently set.
Occasionally you'll want to check several or all of the instructions stored in
program memory. The HP-10C enables you to review program instructions
either forward or backward through program memory:
• Pressing  (single step) while the calculator is in Program mode
advances the calculator to the next line in program memory, then displays
that line number and the keycode of the instruction stored there.
• Pressing ´‚ (back step) while the calculator is in Program mode
sets the calculator back to the previous line in program memory, then
displays that line number and the keycode of the instruction stored there.
For example, to display the first two lines of the program now stored in program
memory, set the calculator to Program mode and press  twice:
Keystrokes Display
¥ 00-
Sets calculator to
Program mode and
displays current line of
program memory.
 01- 36
Program line 01:
v.
 02- 1
Program line 02: digit 1.
Pressing ´‚ does the reverse:
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