Display comma placeholder

Correct. The 30Xa will not display commas.

Correct. The 30Xa will not display commas.

I don't know which particular calculator model you have, but for an HP-12C, the manual says the following:
Digit Separators
As a number is keyed in, each group of three digits to the left of the decimal point is automatically separated in the display. When the calculator is first turned on after coming from the factory - or after Continuous Memory is reset - the decimal point in displayed numbers is a dot, and the separator between each group of three digits is a comma. If you wish, you can set the calculator to display
a comma for the decimal point and a dot for the three-digit separator. To do so, turn the calculator off, then press and hold down the [.] key while you press [ON]. Doing so again sets the calculator to use the original digit separators in the display.

Yes,it's possible to program the Fx-82es to separate the digits with the help of comma.
PLEASE FOLLOW THE INSTRUCTION CAREFULLY.
If you make a mistake then please turn the calculator off and start over again.
====
Turn the calculator on.
GO TO Display setup screen
Disp 1
You will has two options
1 for DOT (that's not what you want)
2 for Comma (please press 2 and enter/triangle pointing to the right)
Please let me know are you able to get to setup mode and make the comma change on reply.

Decimal Point and Separator Symbols
You can use the display setup (Disp) screen to specify the symbols you want for the decimal point and 3-digit separator.
• To change the decimal point and separator symbol setting, press the MODE key a number of times until you reach the setup screen shown below.
Display the selection screen. (Disp) 1.
Press the number key ( 1 or 2) that corresponds to the setting you want to use.
1(Dot): Period decimal point, comma separator
2(Comma): Comma decimal point, period separator

Hi,

P12c display from Comma to Point This document describes how to change the display of the decimal point on the HP 12C (HP12C) Calculator from a comma (commas) back to a decimal point.
Instructions

1. Turn off the calculator.
2. Hold down the decimal point.
3. Continue to hold the decimal point key, while turning on the calculator.

The comma should change back to a decimal point.
Explanation The comma is the European equivalent of the decimal point.
This procedure is also applicable to HP12CP (Hewlett-Packard 12c Platinum) and HP12CPA (Hewlett-Packard 12c Platinum 25th Anniversary Edition).

Let me know, if needed further assistance.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Hello,
Here is help from the calculator manual.

If you wish, you can set the calculator to display a comma for the decimal point and a dot for the three-digit separator. To do so, turn the calculator off, then press and hold down the [ . ] key while you press [ON]. Doing so again sets the calculator to use the original digit separators in the display.

Hope it helps.

Hello,
The comma is a three-digit separator that appears if number with many digits are displayed ( millions, billions). Since it is a financial calculator designed for money calculations, the comma can be helpful.
There is nothing in the manual that suggests that the three-digit separator can be removed. It can however be replaced by the point as in European Countries (especially France) where the decimal mark is the point and the three-digit separator the comma.

In short. I do not think you can get rid of the comma.

Hope you can learn to live with it.

Sorry, but this calculator doesn't give you digit separators.

To change the ´comma´, make sure the calculator is switched to off, press (.) key and maintain, switch the calculator ON. This operation changes dot to comma and vice-versa.