I have a Bally 6803 machine. I bought lockwhenlit 6116 specific chip. I cut out the nicad battery and placed the chip in at u4. Powered on the machine a got nothing. I did not notice that this thing can also be used as a 6264. Removed a properly seated at the 6116 slot. Powered on the machine at an error during boards self test at the u4. Removed everything and replaced with original battery and original ic. Same result. Did I just ruin this mpu?