21. They also invented the relational database ( Codd ) and the RISC computer architecture . 22. Most commercial computer architectures lack such MMU support for capabilities. 23. Modern computer architectures typically use NMIs to handle non-recoverable errors which need immediate attention. 24. Unix-like systems run on a wide variety of computer architectures . 25. In most common computer architectures , 8 bits are grouped together to form a byte. 26. Another popular computer architecture that utilizes the 6U-160 Eurocard is CompactPCI and CompactPCI Express. 27. First year students cover mathematical topics, computer architecture , networking, and fundamental concepts of programming. 28. I have also taught graduate-level computer architecture at Stanford University. 29. A word size is characteristic to a given computer architecture . 30. Early computer architectures required coax as the media type from the terminal to the host.