This is an optional change to the ECM for those that want to play with programming. This modification will make your life easier by eliminating the need to erase a chip with a UV eraser each time you program (burn) a new one. INSTALL TIME APROX- 1 HR Now that my Moates EEPROM adapter arrived I figure I need to install it. I will also show the socket I have been using for years on another ECM that allows me to just plug in a ZIF socket, the original chip without the plastic GM holder, or the Romulator that I use for Real Time-on the fly programming!!! Here's the ECM I started with. 1227747 C3 ECM. When ordering the parts remember the most common spacing for the 1227747 is the .6" pin spacing. That's what you see here!! Here's the parts I ordered. The list and prices are in the How to read and change your program thread. First thing to do is remove the screws and cover. Don't forget the 2 screws on top!! Then the 2 screws for the small PCB-(printed circuit board) also called the daughter card, and the chips. Here is the new socket next to the factory one. The optional socket that I have used before comes from about any electronics store. I picked this one up from Fry's. Here's the bottom of the card. Everyone has their prefered method of removing solder. a standard solder sucker is nice but I don't have one!! But before we can remove solder there is a clear urethane all over the board that needs to be scraped off the pins. A simple jewlers screwdriver will work. This is what I use at home to remove solder. It's soldering wick. I just coat a little flux on the the wick and as you heat it up over the joint, it will draw the solder to the heat!! Now that the bottom is fairly clean lets move to the top. You can pop the plastic right off the pins so they can be removed 1 at a time. Then you can use a pair of needle nose or forceps or just the jewlers screwdriver to apply slight upwards pressure as you heat the pin... Then use the wick on the top to remove excess solder and clear the holes. Then we start the install. I used a piece of tape to keep in in the holes. Make sure you are using a 25-30 watt pencil tip iron for this work!!! And just when you think you are done... You find 3 partial solder joints!!! With the solder work done this is how the parts stack up. The 24 pin socket is soldered into the board. The 24 to 28 pin adapter is stuck into the top of the 24 pin socket. Just to give you an idea of what is being done with this adapter... Is is basically a pin for pin adapter except for the 4 pins on the exposed end. IIRC these should be pins 1, 2, 27, 28...these 4 pins are all tied to pin 26!!! So for the DIY guy, you could just take a 28pin socket and cut the 4 pins off the bottom, solder them together to pin 26 and then mount it in the board by it's self!!! (just another option that would make for a shorter stack) Here's the stack with the optional ZIF socket. You can use the stock 24 pin EPROM or the 28 pin EEPROM. Or just stick the standard 24 pin socket into the replacement socket and the stock chip can pop right in! (for when your done playing) How about with it all together???? Note the original cover will not go over the ZIF. So to add a little dust protecion I used a little 200 MPH Duct tape!!! Of course it all means nothing if it doesn't work!!! Here is my other modified ECM with a standard 28 pin socket intalled. This allows you to just R&R the chip with out the holder, or install a zif socket, or plug in a romulator for real time programming!