Triprocessor PDP-10 [Was: Re: [multicians] Emacs humor]

Johnny Billquist bqt at
Fri Dec 4 16:10:52 CST 2015

On 2015-12-04 21:52, Phil Budne wrote:
> Rich wrote:
>> [1] "Tops-10" was simply a renaming of an operating system which began on the
>>      PDP-6 in 1964 and continued in an uninterrupted line of development up
>>      through the final release, Tops-10 v7.04 (1988), and maintenance (v7.05,
>>      1993).
> Are you sure about the captialization "Tops"?
> I thought TOPS-10 ran on the DECsystem-10,
> while TOPS-20 ran on the DECSYSTEM-20.

Rich is correct. It's "Tops-10", but "TOPS-20". Water under the bridge...
I can't remember the correct capitalization of DECsystem, though. Maybe 
that too differed?


Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt at             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol

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