I get a sys error on my 1990 vette with my burned chip. I also get no output for speedometer etc. All I did was to try and copy the one I have first. I swap it back and all is oky. The chip burned on my SPEP PLUS and verified. Any help?

Thanks
Doug

ps I am using atmel 29C256 EEPROMS

 

I'm not sure whether your Vette has a '727 with a 128K PROM, but if that's the case, did you stack the bins, or offset the 128K stock BIN when you burnt it to the 256K EEPROM?

John

 

90 is a MAp with the 256k bin and does not need the BIN doublestacked

 

Are you absolutely sure you have the chip installed in the right direction?

 

I'm not sure what anybody on the other side of a computer screen can help you with?

Besides going back and forth reading the original and copy and verifying vs. each other, what else can you do? Have you tried more than 1 EEPROM? Are you using some kind of adapter with the copy and not the original? If the original works, and then copy doesn't then SOMETHING is different about the copy, even if it's as simple as a bad chip that reads OK on a burner but not in the ECM.

 

To relate an experiance I just had.
I just burned a chip for my car on my Toshiba laptop while it was in the docking station. The docking station has its own parallel port since the laptop's is covered when docked. The chip erased fine, programmed fine and verivied to buffer when done. BUT, when I put it in the car it went into "Limp Home" mode. I tried the same thing again, erased, reburned and verified to buffer, it all reported good but when installed it went into limp home again. So I removed the laptop from the docking station and tried again...worked like a champ.
If you are using a laptop for burning, remove it from any docking station/port replicator and use the A/C adaptor for power (not battery). See if this helps any.