21. Memory and I / O were accessed via the Synchronous Backplane Interconnect ( SBI ). 22. The backplane served as the address bus and the ribbon cable as the data bus. 23. BladeFrame is a combination of bladed servers, fabric backplane , firmware and management software. 24. The memory array modules were installed in a dedicated backplane separate from the NMI backplane. 25. The memory array modules were installed in a dedicated backplane separate from the NMI backplane . 26. The Altair bus consists of the pins of the Intel 8080 run out onto the backplane . 27. The DSP90 was a fileserver built using a standard Multibus backplane and I / O controllers. 28. There was no uniform backplane bus. 29. Of the four signals, three are driven by the HBA and one by the backplane . 30. The backplane applications work the same way except for using differential traces instead of twisted pairs.