If we are thinking PDP, there was that Alpha Micro Western Digital WD16 based board which was essentially a PDP-11 on the S-100 bus. See:- http://s100computers.com/Hardware%20Folder/Alpha%20Micro/AM-100/AM-100.htm It was a 4 chip set but ran at 4MHz. The two board set was popular with small business for a time. However I’m not sure it would be practical for an OS today. Would also be a lot of work also to draw up a board (actually probably 2 boards though with GAL’s could probably get by with one). I’m thinking if we wander from the purest approach, and shoehorn a powerful CPU on to the S100 bus, may as well get a fast one and have done with it. I’m really impressed with how the 80386 splices into the bus with two speeds. One for RAM, one for I/O. Should be possible to do the same with other CPU’s John From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of David Fry Hi John, both Vince and Andrew have made mention of an interest in seeing a version of DEC mini computer technology brought onto the S100 bus (if this is possible). This idea is beginning to grow on me and I would like to add my interest to the number (now 3 :-) ) I have no experience whatsoever in this area of vintage computing, but what a trip down the history of computing it could be. I noticed that the HD1-6120 seems to be available in small numbers (including from UT source) and also the DCJ11 although price is somewhat higher or maybe some other significant vintage mini...., again I'm not sure how practical a suggestion this is but with the Z80 done and the Intel x86 track done my processor interests are now covered. regards David Fry
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