OT: Elektronika MK-52 / dead EEPROM?

Sorry for OT:

I just bought one of the amazing MK-52 calculators. Unfortunately, I was not able to store programs to the EEPROM. I tried the wiki example and got some unpredictable results when defining the address or doing R/W operations. Sometimes, the machine doesn't (seemingly) respond at all, and other times the display blanks and never returns until switching the calculator off.

The MK-52 operates as expected otherwise, entering and executing programs is also no problem.

Is the EEPROM dead? Can it be replaced?

Thank you,



It appears there's a replacement chip (ER2401). Any good source in europe?

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