Dated 21 November 2008, Al Kossow has made available on Bitsavers the disk image of the SOLO operating system: (http://bitsavers.org/bits/DEC/pdp11/Brinch_Hansen_SOLO/solo.pdf), created by Per Brinch Hansen, as well as the files contained in it in plain text [http://bitsavers.org/bits/DEC/pdp11/Brinch_Hansen_SOLO/extracted_text/]. In them you can see the source of the Concurrent Pascal compiler, as well as another sequential Pascal compiler.
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