2009/1/21 Gordon JC Pearce MM3YEQ <gordonjcp at gjcp.net>: There chips are not rare. In Russia you can buy it for about ~2$. Seems, they are rare on the e-bay only. :) The K1801VM1 was original Soviet design without direct Western analog. The command set was PDP-11 implementing 64 basic commands. The bus was Q-bus -like that simplified system design. If you can read Russian, visit: http://ru.wikipedia.org/wiki/1801BMx -- -=AV=-

hello as I already mentionned ,thanks to the job of our friends in Russia , lots of information is on the group of google for bk0010 http://groups.google.com/group/bk0010/ including complete schematics of the bk0010 that uses k1801bm1, in djvu format (use djvu solo to read) this company make processors http://www.angstrem.ru/index.htm in particular the 1806bm2 that is pdp11/2 compatible and also a pdp11/23 compatible this company makes peripherals http://www.angstrem.ru/index.htm in particular the 1582bj3-123 that is quite close from dlart (dl11 compatible uart+rtc) datasheets are on their site .also on their site are schematics of application for complete system .You can use babelfish to translate,it works well.I do not speak of word of russian but when there is a will to communicate it becomes easier. those chips can be bought at: http://www.rtkt.ru/ that has a page in english about 40usd each. Hope this will help to make things simpler.best regards alain nierveze ----- Message d'origine ----- De : "Don North" <ak6dn at mindspring.com> ? : "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Envoy? : jeudi 22 janvier 2009 08:09 Objet : Re: Russian PDP11 CPU chips on ebay...

sorry the company that makes peripherals is not angstrem but http://www.npofizika.ru/ I can add that I have a few data sheets in russian , I can email them to people who wish.even if someone does not understand russian ,it is easy to understand schematics and timing diagrams. regards a.nierveze

emu> Quoting Gordon JC Pearce MM3YEQ <gordonjcp at gjcp.net>: emu> What's wrong with the original J11's ? I think they look even emu> nicer than the black ones ... emu> And then you could make something like a PRO-385 ;-) Wouldn't it be a PRO-380? Well, unless you can clock it at 20 MHz which was the original plan for the 380, but the J-11 failed to deliver so they ended up at 10. Note that making a PRO-38x means you have to reverse engineer the I/O control gate array and the video hardware, both of which are likely to be serious exercises in masochism. (Why reverse engineer the most bone-headed I/O design in the history of DEC?) Either that, or a lot of discrete parts to make a PRO-350 clone. paul