Let as mate drink a beer.
Ok, let as clear 2 thinks:
1. the data stored in the eeprom ( even in a satellite in the orbit ) is some
setup parameters. Let say on a radio you save to the memory the radio station
what is now playing under the button no 3 on the radio. That info is saved in
some format into the eeprom of the radio. The CPU knows where is the start and end
offset address for that task. Than the CPU have a logic ( format ) how it will be
saved to the memory location in the eeprom. The smallest information what is
possible to write to the eeprom is 1 byte but you can use one bit info too like
this: the radio have 4 mem. station and the info should now be 4 byte long yes?
that would be space wasting. You can write this info into 2 byte like this:
"12 34 00 00 00 00 00 00" and now the CPU knows the first 2 bytes are the numbers
of the mem stations and every single bit are the number of that station.
Ok, I will stop here. maybe I will write an article about these stuff.
2. only the firmware can be dissembled whit a dissembling tool for the exactly CPU.
And the firmware is only in the CPU and not in the eeprom. There is no dissembling
tool for an eeprom. But, I'm on the road to write an article how I dissemble
the eerpom if I have to got the information, that is mush complicated then reading
the mnemonics. 🙂
I live with mnemonics over 25 years and I used a lot until the war time in my
country in the time period 1995-1999. I don't like to remember that time...
I can realize you do something with AVR's? or with MCS-51? and with PIC uC.
I appreciate you, please don't think I'm angry or whatever.
Sorry if I hurt somehow.

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Joe:
Thank you for supporting my article.
For the waiting option:
Most of cars have a so called "Economy mode" which means if you let a consumer
on like the car radio, the main ECU will it turn off after 10-15-30min and all
the computers in the car will go to sleep.
The car is running in economy mode until the shut down time.
You have no option to wait for even 1h.
Lot of now days car radio are connected to the entertainment computer in the car,
if you disconnect the radio from the car and try to power on on your bench without
connected to the car you will see a message on the lcd does the radio is not
connected to the car.Like a message "NO CAN COMMUNICATION".
In this scenario you can wait a life time.
The other problem is, in most of case the user didn't know about the time
counter protection and did not count how much time he/she entered the code.
In this scenario nobody knows how much time you should wait.
Code in the user manual:
This type of car radio or any other OEM audio equipment have no separated user
manual.It is put together with the user manual of the car which in most case are
lost.
Don't forget does this type of audio equipment is an OEM part of the car and you
wont get any support from the car radio manufacturer. In the case of this article
it is a car radio from a Fiat car but the manufacturer is Blaupunk.
If you contact blaupunkt about a lost code they will refuse your request. You have
to visit an authorized Fiat garage and then they will empty your wallet for the code.
The car radio original code is always written on separate card which should be in
the case together with the user manual of the car but, from my experience the code
card which looks like a credit card or the manual are lost in time.
The code is never written on the body of the radio. If you do that than you don the
same think as you left your car on a parking place, lock the doors and put the
car key on the roof of you car.
But I appreciate your thinking logic, and the user should check all the possibilities
before, or remember the code or find it or whatever before they made the steps to
pay for unlocking his/her equipment.
Don't forget, we are repairer and not private investigators.
We have to repair the users tools what we do for money.

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P.S. I am not certain but maybe some other countries can not get
to eBay because of the war situations right now.

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