# What software was used for drawing this schematic?

I was reading a book on digital electronics and the gates with more than two input are drawn differently. I have seen many books that draw schematic in this style. I was wondering what software did they use. I am specifically talking about the way the OR gate is done here.

• Any decent package should be able to draw schematics like that. I know that it is possible with the Pulsonix software that I use, at any rate. – Leon Heller Nov 11 '17 at 13:40
• RubberStamp raised the very nice point that LaTeX with packages like Tikz can be used to draw similar diagrams, albeit discussion showed that this particular gate types might be not readily available. Tikz is, however, extensible through coding. – Marcus Müller Nov 11 '17 at 13:49
• From the manual, I am sure PGF just makes the size of the gates bigger to accommodate more than 2 inputs, it doesn't extend the curvy base as in the picture. Given that PGF can draw any drawing, but drawing circuits without macros will be a pain in the ass. – Ayatana Nov 11 '17 at 13:55
• by the way, the font in the drawings, the style of the gates, the way the strokes ever so slightly differ in width, and the kind of devices shown here point to this being a 1970's American drawing. May I ask from which book this is? – Marcus Müller Nov 11 '17 at 13:55
• That's from 1977 – it would very much surprise me if the editors had software to draw these schematics :) – Marcus Müller Nov 11 '17 at 14:07

That doesn't look like any software was used, but a good old-fashioned drawing board, maybe a few symbol templates/stencils/curve templates used by someone who probably is a trained technical draughtman.

Making such drawings is a job where you actually needed quite some expertise, so technischer Zeichner (at least in Germany) is a proper Ausbildungsberuf (a recognised occupation requiring formal training).

Nowadays, you'll find a lot of circuit drawing software, but my guess is that you'd need to extend them quite a bit to make it easy to draw such legacy diagrams.

Other than that, standard vector graphics software can be used to draw anything that primarily consists of geometric elements.

• " trained technical drawer" : technical draughtsman is the word... just for info as I see your answers often - cheers – Solar Mike Nov 11 '17 at 14:54
• Or "draftsman" in the US. – The Photon Nov 11 '17 at 15:55

As others have mentioned, it looks like that was drawn the old fashioned way, with one of these:

along with some of these:

Tools that once were in every electrical engineer's arsenal, along with one of these:

Battery life was great, and they seldom crashed!

• From the stroke quality, I'd expect the thing to have actually been drawn with one of these earlier ink pens, no idea what they're called, and only (maybe?) pre-drawn in graphite pencil. – Marcus Müller Nov 11 '17 at 22:24
• I had a couple of sliderules crash, when they were sticking out of a textbook and hit a door frame while I was running to class. – Hot Licks Nov 12 '17 at 13:25
• @MarcusMüller You probably mean a technical pen. – Andrew Morton Nov 12 '17 at 16:07
• @MarcusMüller Colloquially, they were called Rotring. (Similar story to Xerox.) – Nick Alexeev Nov 12 '17 at 19:12
• @Marcus Müller a "Rapidograph" pen, maybe? BTW, these templates were moderately expensive. And the ink was called "encre de chine" in french, ironically... – rackandboneman Nov 12 '17 at 23:52

As others have said, they probably didn’t have any particular software available at the time of publication. If you are interested in a modern solution, however, check out the Circuit macros package for LaTeX. It has the wide gate in its library. From the manual:

• @Prime LaTeX can do anything with enough \s. – Alexander Nov 12 '17 at 1:53

I don't believe this was drawn with any modern software tool. It appears to me to be a reproduction from a late-80s/early-90s era databook from before the days of online/digital datasheets. Go to ti.com and look up some of the CD4000-series logic datasheets that are reminiscent of this period. Dual 2-Input NAND

As to the "wings" on the OR, this is typically done to allow the user to better follow the interconnect of the wires by spacing them out.

• Can you expand your answer to say which page of the CD4000-series datasheet the answer to "What software was used for drawing this schematic?" is on? – Transistor Nov 11 '17 at 16:32
• Then consider posting it as a comment. It's not an answer. – Transistor Nov 11 '17 at 16:43
• @Transistor OP stated: "I have seen many book that draw schematic in this style. I was wondering what software did they use." I don't believe this was drawn with any modern software tool. I am stating that this was a copy/reproduction of an older-style printed databook. I believe that is an answer to the question "what software did they use". – M D Nov 11 '17 at 16:47
• "I don't believe this was drawn with any modern software tool." You should put that in your post. (I didn't downvote.) – Transistor Nov 11 '17 at 16:51
• It looks like its PLA (programmable Logic Array) design/programming sheet. I believe it was from Monolithic Memories late 1970's. For more info see electronics.stackexchange.com/questions/5825/… – Venustas Nov 11 '17 at 22:01