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I am looking for a good free online or offline tool to draw processor schematics like this: enter image description here

Further characteristics:

  • If it is not an online tool it could be for linux or windows but online would be preferred
  • I want to use it to draw independent chematics (no logic behind needed)
  • The elements should be placed manually (drag & drop)
  • The program should have elements for processor / logic modulation like in the example picture

Lucidchart for example is relativly close to what I am looking for but in the free version very limited and does not have the needed elements.

  • For what operating system? Is this to draw one-off schematics or do they need to be batch-modifiable? Do you want manual or automatic control over element placement? Do you need custom elements? – Gilles Sep 27 '14 at 12:12
  • @Gilles I tried to specify my request a bit. – kimliv Sep 27 '14 at 12:37
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Xfig is a free schematic drawing software that has a variety of tools and object libraries. Among these are:

  • Electronic Physical - symbols for creating electronic wiring diagrams or layouts
  • Electronic Schematic - symbols for creating electronic schematics

I think your diagram is a combination of these two. The components can be loaded from this button enter image description here

Meeting your requested characteristics:

  • Runs on Linux, and can be installed on Windows through Cygwin/X
  • Only for drawing schematics. No logic needed
  • Elements can be loaded from libaries and moved around with drag/drop
  • The object libraries might not have all the elements you need, but it's not difficult to create your own objects
  • I will try it. An online tool would be a bit better since we are working in a group on it. – kimliv Sep 28 '14 at 0:02
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You may want to take a look at Scheme-it. Regarding the points you mentioned above:

  • it is a (free), online tool;
  • doesn't care about the logic;
  • it uses drag'n'drop;
  • it has different level "views".

(It allows you to work with multiple pages and export your design in different formats - PNG or PDF.)

Caveat: you may need to customize some of the components (place them on the workspace and right-click to Edit them). I don't know whether this is a deal-breaker for you or not. For example, I wasn't able to locate the adders in the scheme you attached.

  • I would appreciate an explanation for the downvote, as I am sure I missed something. – elder elder Oct 4 '14 at 10:22

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