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systems:pdp7_unix [2015/12/30 00:04]
wkt
systems:pdp7_unix [2015/12/30 00:09] (current)
wkt
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 In October 2009, Dennis sent Warren Toomey a private e-mail that said "In other news, I have found the book that has the [PDP-7] listings that I knew I had, that of (some) of the user-level commands. I wonder what's the best way to get it scanned?"​. Unfortunately,​ Dennis passed away before he could get the listings scanned in. In October 2009, Dennis sent Warren Toomey a private e-mail that said "In other news, I have found the book that has the [PDP-7] listings that I knew I had, that of (some) of the user-level commands. I wonder what's the best way to get it scanned?"​. Unfortunately,​ Dennis passed away before he could get the listings scanned in.
 +
 +===== PDP-9 Unix =====
 +
 +In several places, including the [[http://​www.tuhs.org/​Archive/​Documentation/​Papers/​unix_cacm74.pdf|CACM paper]], there is mention made of Unix running on a PDP-9. Dennis Ritchie posted [[http://​minnie.tuhs.org/​pipermail/​pups/​2002-August/​000529.html|a message on the PUPS mailing list]] in August 2002 which said:
 +
 +The [PDP-]7, 9, 15 were very compatible. ​ I think the -15 had some scheme for using an index register, which the earlier ones didn't have, but it was otherwise pretty much identical in IS architecture.
 +
 +There was very little rewriting to try Unix out on the -9 and -15; perhaps just some tweaks in
 +the disk device commands. ​ I don't think the system actually ran on either for more than a few hours. Ken was just playing around.
 +
 +The -15 may have had an electrically different bus, but I'm reasonably sure it was not a Unibus. All of them used IOT instructions,​ not memory-mapped IO registers.
 +
 +Both of the machines we tried were being used by other groups and we couldn'​t squat on them as with the PDP-7. I recall that  the -15's main job was controlling a step-and-repeat camera that exposed LSI masks.
 +
  
systems/pdp7_unix.txt ยท Last modified: 2015/12/30 00:09 by wkt