# Schematic Symbol

**URL:** <https://boards.straightdope.com/t/schematic-symbol/459897>\
**Category:** Factual Questions\
**Created:** [August 13, 2008, 9:32pm UTC](https://boards.straightdope.com/t/schematic-symbol/459897 "2008-08-13T21:32:12Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![Will\_Repair](https://avatars.discourse-cdn.com/v4/letter/w/a698b9/32.png) [@Will\_Repair](https://boards.straightdope.com/u/Will_Repair)\
**Post date:** [August 13, 2008, 9:32pm UTC](https://boards.straightdope.com/t/schematic-symbol/459897/1 "2008-08-13T21:32:12Z")

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I’m breadboarding a low resolution digital video generator from a very old schematic using a chip from the Atari Pole Position game. One of the components is an OR Gate, at least it looks like it but it has an extra arc.

A quick Paint of the symbol can be seen [here](http://www.willrepair.com/SDMB/or_gate.jpg).

Is this a TTL 7432?

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**Author:** ![sweeteviljesus](https://avatars.discourse-cdn.com/v4/letter/s/898d66/32.png) [@sweeteviljesus](https://boards.straightdope.com/u/sweeteviljesus)\
**Post date:** [August 13, 2008, 9:34pm UTC](https://boards.straightdope.com/t/schematic-symbol/459897/2 "2008-08-13T21:34:52Z")

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That is an XOR gate if memory serves. I don’t know what chip it’s in.

FWIW,  
Rob

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**Author:** ![Terminus\_Est](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/terminus_est/32/3087_2.png) [@Terminus\_Est](https://boards.straightdope.com/u/Terminus_Est)\
**Post date:** [August 13, 2008, 9:43pm UTC](https://boards.straightdope.com/t/schematic-symbol/459897/3 "2008-08-13T21:43:07Z")

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[XOR gate](http://en.wikipedia.org/wiki/XOR_gate).

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**Author:** ![beowulff](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/beowulff/32/542_2.png) [@beowulff](https://boards.straightdope.com/u/beowulff)\
**Post date:** [August 13, 2008, 9:51pm UTC](https://boards.straightdope.com/t/schematic-symbol/459897/4 "2008-08-13T21:51:36Z")

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A 7486 is a quad 2-input X-OR, not a 7432.

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**Author:** ![Will\_Repair](https://avatars.discourse-cdn.com/v4/letter/w/a698b9/32.png) [@Will\_Repair](https://boards.straightdope.com/u/Will_Repair)\
**Post date:** [August 13, 2008, 11:12pm UTC](https://boards.straightdope.com/t/schematic-symbol/459897/5 "2008-08-13T23:12:45Z")

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Thanks, all.

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**Author:** ![Voyager](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/voyager/32/133_2.png) [@Voyager](https://boards.straightdope.com/u/Voyager)\
**Post date:** [August 13, 2008, 11:52pm UTC](https://boards.straightdope.com/t/schematic-symbol/459897/6 "2008-08-13T23:52:14Z")

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The Xor schematics I’m used to seeing look more like the one in **Terminus Est** ’s link, but [here](http://www.aaroncake.net/electronics/schem.htm) is a reference for schematics, and it has the pointy one you have. You need to hit next a few times to get to your symbol.

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**Author:** ![Leaffan](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/leaffan/32/299_2.png) [@Leaffan](https://boards.straightdope.com/u/Leaffan)\
**Post date:** [August 14, 2008, 12:05am UTC](https://boards.straightdope.com/t/schematic-symbol/459897/7 "2008-08-14T00:05:25Z")

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Well, I’m glad I knew that too on first glance. (Some college memory still intact.)