Foldable keyboard

1. A portable keyboard comprising

a first housing;

a second housing;

a center hinge plate;

a first key assembly; and

a second key assembly wherein

said first key assembly is mounted to said first housing;

said second key assembly is mounted to said second housing;

said center hinge is slidably and rotatably coupled to said first housing;

said center hinge is rotatably coupled to said second housing;

said first housing and said second housing can be folded together around said center hinge into a closed position;

said first housing and said second housing can be unfolded into an open non-interlocked position; and

said first housing and said second housing can be slid together from said open non-interlocked position into an open interlocked position where said first key assembly is contiguous with said second key assembly.

2. The portable keyboard according to claim 1 further comprising:

a hinge plate slidably coupled to said first housing and having an end pivotally coupled to said center hinge plate such that;

when said keyboard is unfolded and said hinge plate is in a first position said first housing and said second housing are in said open non-interlocked position; and

when said hinge plate is in a second position said first housing and said second housing are in said open interlocked position where said first key assembly is contiguous with said second key assembly.

3. A portable keyboard according to claim 1 further comprising:

a key membrane cable that transmits electrical signals from at least one of the first key assembly and the second key assembly.

4. A portable keyboard according to claim 3 further comprising:

a folded region of the key membrane cable that unfolds when the first housing and the second housing are slid apart.

5. A portable keyboard according to claim 1 further comprising:

a connector that automatically rotates upward when said first housing and said second housing are unfolded.

6. A portable keyboard comprising

a first housing having a protrusion extending therefrom;

a second housing;

a housing hinge plate having an elongated opening;

a center hinge plate;

a first key assembly; and

a second key assembly wherein

said housing hinge plate is inserted inside said first housing such that the protrusion extends through the elongated opening;

said first key assembly is inserted inside said first housing above said hinge plate and affixed to said first housing;

said second key assembly is inserted inside said second housing and affixed to said second housing;

said housing hinge plate is rotatably mounted to said center hinge;

said second housing is rotatably mounted to said center hinge; and

said housing hinge plate slides inside said first housing when said first housing and said second housing are slid together.

7. A portable keyboard according to claim 6 further comprising:

a key membrane cable that transmits electrical signals from the first key assembly or the second key assembly.

8. A portable keyboard according to claim 6 further comprising:

a folded region of the key membrane cable that unfolds when the first housing and the second housing are slid apart.

9. A portable keyboard according to claim 5 further comprising:

a connector that automatically rotates upward.

10. A portable keyboard comprising:

a first keyboard portion;

a second keyboard portion; and

a center hinge plate for pivotally coupling said first keyboard portion and said second keyboard portion;

wherein said center hinge plate is slidably coupled to one of said first keyboard portion and said second keyboard portion such that said first keyboard portion and said second keyboard portion move between an open non-interlocked position and an open interlocked position where said first keyboard portion and said second keyboard portion are substantially contiguous.