The notes on this page http://wiki.nesdev.com/w/index.php/AxROM say there is a positive CE line on pin 2 driven by PRG R/W. On this page http://wiki.nesdev.com/w/index.php/Mask ... 2832pin.29 it puts the positive CE on pin 31 and pin 2 is another /CE line. I don't know which one is correct but thought I should point it out.