I have been working on a makino leblonde rmc55 with fanuc om controls. It has a pmc type L woth the oel and oe2 chips. After lots of research i gathered everything i needed and can now edit ladder in fladder dos program. I made my changed and long story short burnt my 2 new chips. I kept the originals and bought 2 new chips that were the exact same. 27c256. I installed them and fired the machine up. Everything loads great no errors. Buttt when i go into the ladder on the machine. Nothing has changed. Its just like the original chips. Does this think keep it in memory or something? Or did i do something wrong. Thanks guys.