12.3. PC/104 and PC/104+
Currently in the industrial world, two bus architectures are quite
fashionable: PC/104 and PC/104+. Both are standard in PC-class
Both standards refer to specific form factors for printed circuit
boards, as well as electrical/mechanical specifications for board
interconnections. The practical advantage of these buses is that they
allow circuit boards to be stacked vertically using a plug-and-socket
kind of connector on one side of the device.
The electrical and logical layout of the two buses is identical to
ISA (PC/104) and PCI (PC/104+), so software won't
notice any difference between the usual desktop buses and these two.