pdp11 CPU on S100 board

pdp11 CPU on S100 board? Given that old Soviet knockoffs of pdp11 cpus can be found on ebay, I was wondering if anyone else has thought of making S100 boards containing said processors. -- David Griffith dgriffi at cs.csubak.edu <http://www.classiccmp.org/mailman/listinfo/cctalk> A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail? -----reply----- Hi Dave, I've been monitoring the S-100 PDP-11 CPU board thread and have a couple of observations. I did not know the Russian clone PDP-11 CPU chips lacked datasheets. This is a major problem but maybe surmountable with prototyping. Also, I was very surprised to learn there are no free/open source operating systems for the PDP-11 which would be required to adapt for existing S-100 peripherals. Apparently not even NetBSD is available which is stunning as it runs on practically every CPU in some form AFAIK. The lack of free/open source operating systems is a major problem since it then requires all the PDP-11 peripherals to be hardware compatible. As a result, either the entire PDP-11 CPU with all peripherals fit on a single S-100 board or a suite of dedicated boards would be needed. Neither scenario is realistic IMO. The only remaining practical options IMO are to either write/port a free/open source operating system to PDP-11 (an enormous task) or design an S-100 board with FPGAs and blow in the whole PDP-11 design (CPU with peripherals). The latter option rather defeats the purpose of using an S-100 bus since you can't easily share other boards and it may be easier to just make a PDP-11 SBC. Sorry the S-100 PDP-11 CPU board project does not seem practical at this time. However if anyone has ideas on how to resolve these issues and launch a community project I would be glad to support as best I can. Thanks and have a nice day! Andrew Lynch