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The data communication
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agent allocated American Airlines assigned available block list bits boundary registers buffer central computer central processor chain channel word character communication complete contains control field control program control word core memory core storage CPU queue cylinder data processing system debugging digits disk file drums enable enter entry block error example executed flight functions gives control gram gross index Hence I/O requests indicator initiated input message input-output request installation instruction counter interrupt subroutine large number load macro memory protection Mercury milliseconds multiprogramming necessary needed obtain occurs operational program output messages overflow passenger name record phase placed pointer word position possible problem procedure process storage Project Mercury protection mode queuing RAMAC real-time systems relocation register reservation rotational delay Sabre seek simulation specifications stored subchannel tape technique terminal interchange testing throughput tion toll booth track transaction transmission transmitted trap unit users waiting