DEC MKA11 and/or M8261/M8163

So ... I should have stretched my mind a bit more in the space of "stuff like an 11/70 but which is not an 11/70 ...". Encountering even a bit of an 11/74 was simply not something that I ever considered. Thanks for the pointer Johnny! Looking at the preliminary Docs, Figure 1-1, where a two-processor configuration is laid out, with two MKA11, it appears that they have their ports cross-wired and then driven from a panel-control of some sort. So there's 6-bits for MK0A/MK1A, and then a separate 6-bits for MK0B/MK1B (see earlier response to Eric about the connector arrangements). Not at all clear to me how that wiring relates to the description in 1.4.2. Need to think about this some more ... It seems then that the Field Guide has both of these modules mis-assigned, and the second misnamed. I wonder if the relationship between the M8163 and M8164 is an either/or and they go into the same slot given that Table 1-1 mentions only a single Multiport Multiplexor (M8162) and the naming in Table 1-3 for the M8163 is "Single Port Jumper Card"? I guess that's what you're thinking as well. What is the purpose of the "panel" Port Controllers, given that they seem to be not connected to any control signals from the CPU? (Figure 1-1) Does the "T" in the symbology in the Figure perhaps indicate "Terminator"? If so, that seems to suggest that the signaling is out one control, into the second and then off "through" a terminator to the panel Port Control? Honestly, Figure 1-1 doesn't look to me like a shared-memory arrangement ... so I'm probably misinterpreting some of those lines at the moment. Thanks for all of the additional clues and pointers guys! On Thu, Feb 12, 2015 at 5:24 AM, Johnny Billquist <bqt at update.uu.se> wrote: