What I meant was that the control for a 2311 in an 1131 is the cheap kludge - one shots, delays, and the like - when compared to the "real" controller, the 2841. This control unit was very complex - probably more so that an entire 1130 system. I have no real engineering data (Big Blue Binders) on the 2841, but it actually would not suprise me is the 1131 or 1800 was the processor inside (or maybe a modified version).