G - Physics
06
F
354/239
G06F 3/00 (2006.01) G06F 13/10 (2006.01)
Patent
CA 1084632
BUFFER CHAINING ABSTRACT OF THE DISCLOSURE In a data processing system allocation of excessive main/working storage space to sequential input records (input blocks) of indeterminate length frequently results in wasteful fragmentation. This is avoided by the present invention. An input-output channel of conventional construc- tion is modified so that in chaining mode it (the channel) can operate optionally to: 1) transfer sequential input data blocks of unspecified length into contiguous positions in main storage, and 2) without CPU interruption/intervention store delimiting information, in storage locations contain- ing Channel Command Words (CCW's) designating respective transfers, which effectively distinguishes storage bound- aries between adjacent blocks. The storage of delimiting information effectively relieves the control and application programs of the central system of responsibility for analyzing the information context of the data in each block for "possibly obscure" delimiting intelligence. The foregoing routing and delimiting operations may be made entirely transparent to the peripheral attachment interface of the channel so that peripheral attachment is not complicated.
278860
International Business Machines Corporation
Na
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