Jim, I finally have gotten to trying to install the JiffyDos chips I got from you, but I have a problem. I have one chip labelled 1541 DOS which is a 24 pin and the socket on my 1541C drive is 28 pin. Then I have. Another chip that is a 28 pin with no label and that's not a match for a non V4 motherboard on my C64C. The 1541 chip board has 2364 written on it. The other chip board has 23128-23512. My understanding is the 1541 chips should be all the same yes? Why is it the wrong size? Or should the labels have been swapped out? Also the 1541 chip has the wires soldered to pins 1 and 8. The other board has them wired to 1 and 2. So which chip is which and do I have the right set? Sent from my BlackBerry device on the Rogers Wireless Network