IIRC, John McNamara designed the CR8/e and the two CR11 boards. My recollection is based on the fact I picked up the last bit of CR8e Initially, I think there were thought to be some differences in "Punch" cards and timing, real holes and just the black marks. That initial issue seemed to indicate two types of readers and different timing. I recall working with some card punch gear on the 8 or 11 attempting to use the same cards. That is about all I can recall but maybe that will spur some thoughts. On Wed, Jan 23, 2019 at 6:45 PM Noel Chiappa via cctalk <cctalk at classiccmp.org> wrote: