The Q-bus, also known as the LSI-11 Bus, is one of several bus technologies used with PDP and MicroVAX computer systems previously manufactured by the Digital Equipment Corporation of Maynard, Massachusetts.
LSI-11/23 Q-Bus cards and slots
DEC BA213 cabinet; 12 Q-Bus-22 slots
1 MBit Bubble memory dual-width Q-Bus expansion card
8K × 19 bit core memory quad-width Q-Bus expansion card
In computer architecture, a bus is a communication system that transfers data between components inside a computer, or between computers. This expression covers all related hardware components and software, including communication protocols.
Four PCI Express bus card slots (from top to second from bottom: ×4, ×16, ×1 and ×16), compared to a 32-bit conventional PCI bus card slot (very bottom)