On 2015-01-14 16:03, John Many Jars wrote: I'll leave that to someone else. While I know of one person who started such a project, I don't know of anyone who have finished it. And I don't know how feasible it would be to do under RSTS/E. I played with lots of tricks and used a lot of RSX capabilities to manage it in my case, and it will not run on plain 11M. Johnny -- Johnny Billquist || "I'm on a bus || on a psychedelic trip email: bqt at softjar.se || Reading murder books pdp is alive! || tryin' to stay hip" - B. Idol

On 2015-01-14 17:55, Pontus Pihlgren wrote: There are lots of things that becomes complex and/or odd when you are on a machine with a word size that is not evenly divisible by 8. You need to manipulate bitfields inside a word, and depending on how things work, you might either span word boundaries, placing half of an octet in one word and the other half in the second, or else have four extra bits sitting around that you should ignore in every word. All arithmetic are done on 16- or 32-bit quantities, which you must take into consideration. The IP checksum is an odd beast that do ones complement addition. So spillover from the 16-bit additions are added back at the bottom. Everything is of course doable, but there will be a whole lot of bit fiddling and juggling doing TCP/IP on a PDP-10. Johnny -- Johnny Billquist || "I'm on a bus || on a psychedelic trip email: bqt at softjar.se || Reading murder books pdp is alive! || tryin' to stay hip" - B. Idol

On 2015-01-15 12:41, Lars Brinkhoff wrote: They are. But you also have to, sometimes, do calculations to create your byte pointers, as the byte you want to start looking at might not be at the beginning of a word. And the same is true for some 16- or 32-bit quantities. And you need to do arithmetic on 16- and 32-bit with the correct byte ordering, which might mean you have to move bytes around, and truncate things. The story goes on. Like I said, it is definitely doable, but it do require some fiddling. The devil is in the details. Once you actually start coding, you'll discover all the small annoyances. Johnny -- Johnny Billquist || "I'm on a bus || on a psychedelic trip email: bqt at softjar.se || Reading murder books pdp is alive! || tryin' to stay hip" - B. Idol