The 27C400 is a 512k device and 16 bit Kickstart 1.2 and 1.3 are only 256k. In order for that eprom to program properly and work you have to load the binary image file twice. Once at 0x00000-0x3FFFF and again to fill the other half of the eprom at 0x40000-0xFFFFF (It's been a long time but I think this is correct, anyone?). Use the buffer editor or viewer to make sure the data has been loaded correctly. You could also use a 27C200 for 256k ROM images as I recall. Check the BYTE order using the buffer editor as well and make sure you don't have to have BYTE SWAP enabled on your burner. You REALLY need a UV eraser as you will no doubt end up trying a few times before you get the process and your programmer figured out. Good Luck!
