unlock atmega 128 chip?

[chopstikz817]

hi i accidently locked my atmega 128 card when i program it at 18.00mhz clock speed. the speed of the crystal is actually 18.432mhz. plz if any know how to get the atmega card back to its orginal state plz help me with instruction my email is xxxxxxxxxxxxxxxxxxxx thanxx!!!!

No e-mails,for your own security...just as easy to do it through PM

[Darnat]

Does your atmega have a Jumper?
If so try this fix....
1. Load up jeepers, and plug everything in for your atmega as normal (ie atmega in
programmer, plug cable into computer)
2. make sure jumper is ON
3. click the atmel tab, ATmega128, erase/flash eeprom
4. when it says erasing eeprom, PULL THE JUMPER
5. Do this 3 or more times
6. then do full monty, when it says erasing eeprom, PULL THE JUMPER, and when it says
writing, PUT THE JUMPER BACK ON
7. You will get errors, go back and repeat steps 3 to 6. You will notice that each time you do
the full monty, you will write a little more to the card before you get an error.
8. eventually you will write the card, and you will be able to erase the eeprom WITHOUT
PULLING THE JUMPER
9. your atmega is fixed. Always program at the correct frequency (18mhz for efa, 18.43 for blue
card with switch)
Your settings should be FF AF 89 FF


If it is Jumperless..try this fix..

http://www.dssftp.com/forum/upload/showthread.php?threadid=3777

[chopstikz817]

no my atmega 128 does not have a jumper

[Darnat]

So it's Jumperless and you may try the fix I posted above!

[Darnat]

Good to see your trying!

[mattster1972]

the link above for jumperless fix is dead :-(

mattster

[SEARCHY4]

programing it at 18 mhz wouldnt cause it to lock out.

whats it doing when you try and re program it.
is it saying no atmega card detected.

[hackkil]

i had 1,the fuse bits got screwed up,wouldn't erase or do anything,so i had to do the usb hack to make sure it got the 5 volts needed to run.i cut the end off a usb cord,stripped back the red and black wires,then soldered them to the 10 pin programmer i have. Havn't had any trouble since.

[eric keri]

programing it at 18 mhz wouldnt cause it to lock out.

whats it doing when you try and re program it.
is it saying no atmega card detected.

SEARCHY !!!! I have an atmega that says no atmega card detected. What can I do there. I really dont remember what happened. It is the red atmega128 jumperless card.
5v mod done to programmer.
I know it isn't the programmer, it programs my other 128.
O yea 18.432 crystal!