I’m trying to workout the exact coding needed for CB RESP on the test device. Now my memory is I was told all the carriage events listed in the circuit diagram fragment below are signaled. However, that doesn’t sit well with the wiring for them being in series.
An email discussion with Olly last night dug out the fact that the IBM circuit diagrams use their own standard for symbols not the common one. So what exactly do those little circles on the top and bottom switches mean? The upshot is that it looks like I’m going to have to get out the meter and hand cycle tool to work out what actually happens with the coding of those switches.