Multibus was an asynchronous bus that accommodated devices with different baud rates while maintaining maximum throughput. It had 20 address lines, so it could address up to 1 MiB of memory and 1 MiB of I/O ports. Most Multibus I/O devices decoded only the first 64 KiB of the address space.
The Multibus supported a multi-master feature that allowed it to share the Multibus with multiple processors and other DMA devices.
IIEEE-796 Multibus Standard: Microcomputer System Bus; First released by Intel in 1974.