However, the date at the bottom of each page of the source listing is 3/17/72. My assumption is that the code was from that date, but that the author of the memo spent a few months writing up the text that goes along with it. That's why I've been assuming that it was code somewhere between Version 1 and Version 2. If possible, can you scan them at 400dpi or 600dpi? Those are much more amenable to OCR than 300dpi. Alternatively, if you can send me a hardcopy, I will scan it at 600dpi and pass it along to bitsavers. I have already noticed quite a few errors in the listing, so it's not clear that the PDF was something that actually ran, or whether it had been re-typed by somebody. So far, many of the errors I have found are in the "cold" portion of it, so it may be that the "warm" code will run properly. James Markevitch