Section 14: Flags continue230
Keystrokes Display
PRGM
 0

XEQ
ALPHA PROOF ALPHA    When program execution begins, PROOF begins timing you for about five seconds. If you press a number key before the timing is over, the tone will not sound. But if you take too long to press the number key, the tone will sound and the program will immediately begin timing again.
R/S
 0
Press R/S to halt execution.
USER Mode Flag
This flag (flag 27) is used to place the calculator into and out of USER mode. When flag 27 is set, the HP-41C is placed into USER mode. When cleared, the HP-41C is taken out of USER mode.
You can set, clear and test flag 27 just like a general purpose flag, but keep in mind that this flag also controls USER mode.
The status of flag 27, whether clear or set, is maintained at all times by Continuous Memory, even when the calculator is turned of and on.
Number Display Control Flags
Two flags, the decimal point flag (28) and the digit grouping flag (29) are used to control how numbers appear in the HP-41C display.
The decimal point flag (flag 28) controls the radix mark and the separator mark in a number. A radix mark is the divider between the integer portion of a number and the fractional portion of a number. The separator mark is the separator between groups of digits in a large number.
In Europe, and many other international locations, the radix mark is the comma and the separator mark is the decimal point. So numbers appear like this: 123.456.789,123. In the U.S. the radix mark is the decimal point and the separator mark is the comma. Numbers appear like this: 123,456,789.123. The decimal point flag (28) allows you to use the radix mark and the separator mark with which you are accustomed.
When flag 28 is set, the decimal point is the radix and the comma is the separator. Numbers appear like this: 123,456,789.123.
When flag 28 is clear, the comma is the radix and decimal point is the separator. Numbers appear like this: 123.456.789,123.