I have Dual Power Willem using 97ja. The chip Im trying to copy is a ST m27c256 onto a AT29c256.
I have successfully read the info off of the 27c256 and can pull the bin up into a Hex editor. I also did a verify when I Read the info also.
I have done my homework and the Dips and jumpers are correct for the 29c256. Actually when the chip is written to it writes successfully and is verified OK. When I put chip in car ecu it will not run car. The m27c256 runs car just fine.
I also am using 9v power to the Willem instead of usb. I have tried both. Am I missing something? Thanks
If your At29C256 writes successfully and is verified OK, then your copy is successful. My previousse post means the AT29C256 may have problem for direct replacement of 27C256. Because the AT29C256's pin 1 is differet to 27C256's pin 1.