Electronic circuit

1. Electronic circuit comprising:

a) a motherboard,

b) an input/output connector mounted on the motherboard, said input/output connector comprising at least one group containing N input/output contacts, N being a natural number greater than or equal to 2;

c) at least one set containing expansion slots ( 80 to 91 ) mounted on the motherboard, each expansion slot of the at least one set having expansion contacts electrically connected to input/output contacts of the at least one group;

each input/output contact of the at least one group being identified by an identifier T, each expansion slot of the at least one set being identified by an identifier S, each connected expansion contact ( 12 ′) being identified by an identifier R, the identifiers T, R, and S being integers greater than or equal to 0;

characterized in that, for:

each expansion slot of identifier S of the at least one set, and

each connected expansion contact of identifier R,

each input/output contact of identifier T of the at least one group is electrically connected to a single expansion contact of identifier R of the expansion slot of identifier S of the at least one set, and in that

the identifier T of the input/output contact of the at least one group is calculated as a function of the R and S identifiers, according to the following relation:

T =[( R+D×S )modulo( N )]

where D is fixed in each group and is an integer sub-multiple of the natural number N.

2. Electronic circuit according to claim 1 , including at least one expansion card comprising at least one electronic component and at least one contact pin electrically connected to said electronic component, said at least one contact pin being arranged at one end of the expansion card and inserted into at least one expansion contact of at least one expansion slot, and wherein the natural number D is less than or equal to said contact pin number.

3. Electronic circuit according to claim 2 , wherein said at least one electronic component is connected to multiple contact pins, said contact pins being directly adjacent to one another.

4. Electronic circuit according to claim 1 , wherein the expansion contacts are identified by identifiers in ascending order from left to right or from right to left, and wherein the expansion slot connected directly to the input/output connector, referred to as the first expansion slot, has an identifier S equal to 0, said expansion slot directly connected to said first expansion slot having an identifier S equal to 1.

5. Electronic circuit according to claim 1 , wherein the identifier S varies between 0 and at least (N/D)−1.

6. Electronic circuit according to claim 1 , wherein the natural number D is equal to 1.

7. Electronic circuit according to claim 1 , wherein the natural number D is equal to 2.

8. Electronic circuit according to claim 1 , wherein the natural number D is equal to 4.

9. Electronic circuit according to claim 1 , wherein the input/output connector is integrated into the calculation unit.

10. Electronic circuit according to claim 1 , having at least two sets, the expansion contacts of a set being electrically connected to the input/output contacts of a group,

and wherein the expansion slots are arranged on the motherboard in a grid arrangement,

said expansion slots of a same set being aligned along a first straight line; at least two expansion slots of two different sets being aligned along a second straight line extending perpendicularly to the first straight line.

11. Electronic circuit according to claim 1 , having at least one expansion card inserted into at least one expansion slot, said expansion card extending perpendicularly to the motherboard.

12. Electronic circuit according to claim 1 , having at least one expansion card inserted into at least one expansion slot, said expansion card extending parallel to the motherboard.

13. Electronic circuit according to claim 2 , wherein the expansion contacts are identified by identifiers in ascending order from left to right or from right to left, and wherein the expansion slot connected directly to the input/output connector, referred to as the first expansion slot, has an identifier S equal to 0, said expansion slot directly connected to said first expansion slot having an identifier S equal to 1.

14. Electronic circuit according to claim 3 , wherein the expansion contacts are identified by identifiers in ascending order from left to right or from right to left, and wherein the expansion slot connected directly to the input/output connector, referred to as the first expansion slot, has an identifier S equal to 0, said expansion slot directly connected to said first expansion slot having an identifier S equal to 1.

15. Electronic circuit according to claim 2 , wherein the identifier S varies between 0 and at least (N/D)−1.

16. Electronic circuit according to claim 3 , wherein the identifier S varies between 0 and at least (N/D)−1.

17. Electronic circuit according to claim 4 , wherein the identifier S varies between 0 and at least (N/D)−1.

18. Electronic circuit according to claim 2 , wherein the natural number D is equal to 1.

19. Electronic circuit according to claim 3 , wherein the natural number D is equal to 1.

20. Electronic circuit according to claim 4 , wherein the natural number D is equal to 1.