File:Before motherboards.jc.jpg

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When a CPU still consisted of hundreds (thousands?) of small logic modules - each about the size of a cigarette pack - these would be plugged into a large frame (through which ran plumbing for coolant) and then these logic modules would be inter-connected with wires.

This was actually very useful as you could "trim" a wire by lengthening or shortening it to get the pulse timed just right in certain critical sections.

When eventually millions of transistors could be placed on a single chip, all this wiring took place inside the chip - and then chips were inter-connected on a mother-board.

Much less fun, but more reliable...
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Source Flickr: Before motherboards
Author Jitze Couperus
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This image, which was originally posted to Flickr, was uploaded to Commons using Flickr upload bot on 9 May 2012, 11:52 by ArnoldReinhold. On that date, it was confirmed to be licensed under the terms of the license indicated.
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current11:53, 9 May 2012Thumbnail for version as of 11:53, 9 May 20123,744 × 2,140 (3.55 MB)Flickr upload bot (talk | contribs)Uploaded from http://flickr.com/photo/40648743@N00/4333788453 using Flickr upload bot

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