Section 14: Flags continue231
You can set, clear and test flag 28 just like the general purpose flags. The status of the decimal point flag (28) is preserved at all times. Flag 28 is initially set (decimal point is the radix, comma is the separator).
The second flag that controls how numbers appear in the HP-41C display is the digit grouping flag (flag 29). It controls whether or not a separator is used.
Regardless of which separator mark is specified (refer to flag 28 description, above), you can control whether or not a separator appears in the display. If your preference is for separators, you can specify them. If your preference is no separators, then you can turn them off.
When flag 29 is set, groups of three digits in the integer portion of the number are separated like this: 1,234,567.01 or 1.234.567,01.
When flag 29 is clear, numbers are not separated, like this: 1234567.01 of 1234567,01.
The status of flag 29 is preserved at all times. The initial status is set, so numbers will appear like this: 1.234.567.01.
In FIX 0 when both flag 28 and flag 29 are clear, no radix will appear. At any time if there is only one symbol showing in a number, it is always the radix.
HP-41C System Flags
Flag 30 through 55 are all used by the HP-41C system to control the calculator’s internal operation. Some have little value to you, and all can only be tested. Following is a listing and short description of each system flag.
Catalog Flag (flag 30). As with all of the system flags, flag 30 can be tested only. It is used internally for the operation of the catalog feature and always tests clear for you.
Peripheral Flags (flag 31 through 35). These flags are used internally for operation of certain peripheral extension.
Number of Digits (flags36 through 39). These four flags, in combination, are used internally to set the number of displayed decimal digits in FIX , SCI and ENG display formats. The number of decimal digits is determined by the following chart.
Flag status (clear=0,set=1)
No.of digits
 36

 37

 38

 39

0
 0

 0

 0

 0

1
 0

 0

 0

 1

2
 0

 0

 1

 0

3
 0

 0

 1

 1

4
 0

 1

 0

 0

5
 0

 1

 0

 1

6
 0

 1

 1

 0

7
 0

 1

 1

 1

8
 1

 0

 0

 0

9
 1

 0

 0

 1