On 01/24/2017 12:38 PM, Chuck Guzis wrote: > Was the 7070 IBM's first machine with a wire-wrapped > backplane? --Chuck No, all SMS machines used similar wire wrapping. So, I think that goes back to the 7030 (Stretch) and probably 1620, 1401 and others of that time. I'm pretty sure those preceded the 70xx series. Jon