View Full Version : Eeprom Dead, or not working...

01-09-2009, 03:50 AM
Hello all,

I'm not sure about this, but I was just using my hydra board when all of a sudden my programs all stoped working.

So my intial reaction is to think the board died. However, upon inserting an expansion pack the board began to live again. Which implies that something is worng with my eeprom.

The wierd thing is though, that I can program the eeprom with the propeller downloader but that the propller will not boot from the eeprom.

Has this happeded to anyone else? Do I need to buy another chip to replace it?

Thanks for your help,


Mike Green
01-09-2009, 04:09 AM
This is a very strange failure and doesn't make a lot of sense. The same circuitry is involved in communicating with the EEPROM to do a write to program it as it is in doing a read to boot. The decision to transfer data to the Prop rather than the other way around is made deep in the logic of the EEPROM. You might try using a copy of FemtoBasic or DongleBasic to read and write to the EEPROM. When an expansion card is inserted, the on-board EEPROM should appear as the 2nd 128K block of EEPROM. Try cleaning the contacts on the expansion card and the socket, just on general principles.

01-09-2009, 04:26 AM
Heh, the card slot connectors were touching...

Really, that's a fun problem. The expansion card pushed them back to normal.