Computer network having a host-local file I/O operation
First Claim
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1. A data processing system using a plurality of input/out devices comprising:
- a first computer; and
a second computer connected through a network to said first computer and connected to a plurality of input/output devices including at least one operator-controlled input/output device, said first computer having means for requesting one of said input/output devices for data transfer and said second computer including;
(1) operator-controlled designation means for designating an input/output device, of said input/output devices which is different from the input/output requested by said first computer, as an input/output device to perform said data transfer with said first computer; and
(2) control means connected to said first computer, said requested input/output device and said designated input/output device, and having output processing means for receiving from said first computer an output data stream including output data and having a format for said requested input/out device in response to an output request issued by said first computer, for reformatting the received output data stream to produce reformatted data for said designated input/output device, and for outputting said reformatted output data to said designated input/output said reformatted output data to said designated input/output device, and thereafter, for inputting said reformatted output data from said designated input/output device in response to a signal from said requested input/output device, for reformatting said reformatted output data to produce an output data stream having a format for said requested input/output device and for outputting the produced data stream to said requested input/output device; and
input processing means for inputting from said requested input/output device an input data stream including input data and having a format for said first computer in response to a signal from said requested input/output device, for reformatting the received input data stream to produce reformatted data for said designated input/output device, and for outputting said reformatted data to said designated input/output device, and thereafter, for inputting said reformatted input data from said designated input/output device in response to an input request issued by said first computer, for reformatting said reformatted data to produce an input data stream having a format for said first computer, and for outputting the produced data stream to said first computer.
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Abstract
A computer system network with host machines and local machines linked hierachically with each other, wherein if file I/O status flag in control table of a local machine is set to terminal operation replacement mode by command input by terminal user, a data I/O request issued by an application program in a host machine to a terminal connected to the local machine is implemented by the I/O operation on the file connected to the local machine in place of the I/O operation on the terminal.
29 Citations
26 Claims
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1. A data processing system using a plurality of input/out devices comprising:
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a first computer; and a second computer connected through a network to said first computer and connected to a plurality of input/output devices including at least one operator-controlled input/output device, said first computer having means for requesting one of said input/output devices for data transfer and said second computer including; (1) operator-controlled designation means for designating an input/output device, of said input/output devices which is different from the input/output requested by said first computer, as an input/output device to perform said data transfer with said first computer; and (2) control means connected to said first computer, said requested input/output device and said designated input/output device, and having output processing means for receiving from said first computer an output data stream including output data and having a format for said requested input/out device in response to an output request issued by said first computer, for reformatting the received output data stream to produce reformatted data for said designated input/output device, and for outputting said reformatted output data to said designated input/output said reformatted output data to said designated input/output device, and thereafter, for inputting said reformatted output data from said designated input/output device in response to a signal from said requested input/output device, for reformatting said reformatted output data to produce an output data stream having a format for said requested input/output device and for outputting the produced data stream to said requested input/output device; and
input processing means for inputting from said requested input/output device an input data stream including input data and having a format for said first computer in response to a signal from said requested input/output device, for reformatting the received input data stream to produce reformatted data for said designated input/output device, and for outputting said reformatted data to said designated input/output device, and thereafter, for inputting said reformatted input data from said designated input/output device in response to an input request issued by said first computer, for reformatting said reformatted data to produce an input data stream having a format for said first computer, and for outputting the produced data stream to said first computer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A data processing system using a plurality of input/output devices comprising:
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a first computer; and a second computer connected through a network to said first computer and connected to a plurality of input/output devices including at least one operator-controlled input/output device, said first computer having means for requesting one of said input/output devices for data transfer and said second computer including; (1) operator-controlled designation means for designating an input/output device, of said input/output devices which is different from the input/output device requested by said first computer, as an input/output device to perform said data tranfer with said first computer; and (2) control means connected to said first computer, said requested input/output device and said designated input/output device, and having output processing means for receiving from said first computer an output data stream including output data and having a format for said requested input/output device in response to an output request issued by said first computer, and for outputting said data stream to said designated input/out device, and thereafter, for inputting said data stream from said designated input/out device in response to a signal from said requested input/output device, and for outputting said data stream to said requested input/output device, and input processing means for inputting from said requested input/output device an input data stream including input data and having a format for said first computer in response to a signal from said requested input/output device, and for outputting said input data stream to said designated input/output device, and thereafter, for inputting said input data stream from said designated input/output device in response to an input request issued by said first computer, and for outputting said input data stream to said first computer. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification