BUS 237 : Chapter4 review.docx

• School: Simon Fraser University
• Department: Business Administration
• Course: BUS 237
• Professor: Kamal Masri

Document Summary

---- the first generation mainframes : ibm650, were based on now obsolete vacuum tube . ---- second generation mainframes used transistors , which made them smaller, easier to maintain, and more reliable. ---- first and second generation machines were often sold without software: the assumption was that companies themselves would develop the programs they wanted to use on the computer. ---- third generation of mainframe machines included operating systems and multiprocessing. ----the multiprocessing allowed for time-sharing, where many users could share the main processor at the same time. ---- ibm z96 continues to be produced today. And a large number of programs used in larger organizations still run on mainframe systems. ---- incorporated the central processing unit (cpu) and some short-term memory into a single silicon. ---- microcomputers were easy to use; however, they were largely stand-alone. Sharing data cross two computers required saving data on a floppy drive and transferring the drive to another machine.