[HECnet] DECnet/Python

On Oct 28, 2021, at 2:55 PM, John Forecast <john at forecast.name> wrote: The PCL-11B was a CSS product which allowed up to 16 Unibus PDP-11 to be connected together over a TDM bus running at 1 megabyte/sec. I?m pretty sure it didn?t use DDCMP. I?m not sure about Phase II but for Phase III each node was set up as a multi-point master (PCL-0.0) and the remote nodes were multi-point tributaries (PCL-0.1 to PCL-0.15) so it would appear as a fully connected mesh. At the end of Phase III, Hardware Engineering built a small number of prototype Unibus ethernet boards (maybe 10 total) so they could get some experience with ethernet (this was a programmed I/O device with 1 transmit and 1 receive buffer, sort of like some of the early 3Com devices). I used a similar technique to the PCL to get RSX-DECnet Phase III running (slowly) over ethernet.