PICMG 1.3 is a PICMG specification which is commonly referred to as SHB Express.
SHB Express is a modernization of PICMG 1.0 single-board computer specification.
SHB Express, or System Host Board – Express, uses the same physical form factor as PICMG 1.0 boards.
The board-to-backplane interfaces are PCI Express instead of PCI and ISA, although the use of PCI remains as an option.
[1] Adopted : 8/20/2005 Current Revision : 1.0