How to flash a board with an indication on an Atmel mega48v from a Caliber P860 (GeForce 8600GT) video card?

Question

Arduino

Good afternoon.
The project required a digital display. I remembered my burnt video card Caliber P860 (GeForce 8600GT) .

It has a three-digit digital display. Having removed it, I did not unsolder the indicators and was surprised to find an Atmel mega48v controller on the board.
Then a thought was born, it's kind of like a ready-made arduino scarf with outputs, one button and digital indicators.
I couldn't find any information about her on the internet. How would you know the purpose of the exits?
It may not even be necessary to flash, but to supply power and transmit information via digital / analog outputs.
Here is a photo of the scarf:

Answer 1

so look at the datasheet on the chip, then of course there will be nothing on the board, it is custom

Answer 2

On the edge, you can peep the pinout of this case in the datasheet and solder it directly to the feet of the controller for flashing.