Sounds like the Euro standard that the VME boards are based on.
1U= 44.45mm= 1.75 inch.

"Luther, Brandon" wrote:

> Good Day!
>   One of our Engineers was asking about info on a board size of 1U & 2U.
> Does anyone have, or know where to locate any specifics on this type/size of
> board?   I heard there was some old military boards called 1U, 2U etc, but
> the ones I am looking for are much smaller than those.
>
> TIA
>
> Regards,
>    Brandon Luther
>    Dataram Corp.

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