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I have several diagrams that I attached to this post. Does anyone know what software was used to make them? I attached the diagrams as PNG files but in PDF files that I have, they are in vector graphics.

Example 1 Example 2

space bobcat
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    Are you sure it was a specific software package? They look suspiciously like hand-drawn bitmap images ("pixel art") to me. –  Feb 16 '17 at 08:39
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    I don't know which package I'm afraid but I've seen a lot of mid-1980's to (maybe) early 1990's schematics in this style. Could your schematic be that old? – TonyM Feb 16 '17 at 08:54
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    @duskwuff, there must be a software package for this. It is all in vector graphics. All diagrams have very reproducible objects. I have access to hundreds of these diagrams and they all look alike. Drawing it all by hand would be insanely hard. – space bobcat Feb 16 '17 at 08:57
  • @TonyM, I think you are correct. I just checked the archive and saw that most of these schematics are from the 90's. Do you know what software was used back then to make such diagrams? – space bobcat Feb 16 '17 at 09:01
  • They look like AutoCAD drawings to me. – Steve G Feb 16 '17 at 09:20
  • All in vector graphic? What is the file extension? – Antonio Feb 16 '17 at 09:36
  • @Antonio. It is saved as a PDF. Unfortunately, I can't share the documents. – space bobcat Feb 16 '17 at 09:53
  • @SteveG, thanks! Could you please show me an example of an AutoCAD diagram that looks very close to these above? I will try to check tomorrow if AutoCAD produces such diagrams. – space bobcat Feb 16 '17 at 09:54
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    Does the PDF file happen to have any relevant information in its properties? (A PDF viewer should be able to show you.) – Andrew Morton Feb 16 '17 at 10:46
  • @AndrewMorton, I checked several files now. They seem to have "Acrobat Distiller 4.05 for Windows" as producer. One publication has "Corel Office Document" as its title. – space bobcat Feb 16 '17 at 21:46
  • @ViacheslavPlotnikov Aha! It could be that Corel Draw was used with an electronic symbols library. – Andrew Morton Feb 16 '17 at 22:14
  • @AndrewMorton, you just solved this! I didn't even think that Corel Draw can be used for schematic diagrams. Please write an answer for this post and I will mark it as "correct". Thanks a lot! – space bobcat Feb 16 '17 at 22:49

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The presence of "Corel Office Document" in the properties of one of the PDF documents suggests that Corel Draw was used to produce them.

Electronic symbols libraries are available for Corel Draw.

The presence of "Acrobat Distiller 4.05 for Windows" might mean that Acrobat Distiller was then used to shrink some of the PDFs and/or make them more generally compatible with PDF readers.

Andrew Morton
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