Just bought a HP-67 calculator at an auction

[mipidc]

Thanks everyone for the info. This is a great venue! I did go ahead and ordered a battery pack from waterhosko. I should get it in a day or two. I will let you know if it works. Even though I probably won't use it, does anyone know of where I can get a mag strip to test the reader? Based on the responses it will be interesting to find out if it works!