Boots – shoes – and leggings
Patent
1980-03-24
1984-06-05
Gruber, Felix D.
Boots, shoes, and leggings
G06F 1300, G06F 1308
Patent
active
044532091
ABSTRACT:
Operations to prepare a secondary paging store for a data transfer relative to a central processor main store are overlapped in time with chaining operations of an input-output channel relative to the main store for preparing a command defining the transfer operation. In a preferred embodiment the paging store is organized for sequential access to page records and the operations to prepare the paging store include a calculation of a "roll mode" displacement factor which defines a randomly chosen displacement position in a designated page area for beginning the transfer with minimized latency. This factor is calculated as a function of channel operational characteristics as well as the bit timing rate of the paging store. The displacement calculation is also adapted for a paging store having different timing rates for transferring data and regenerating stored data. The displacement factor is stored in a buffer register and conditionally transferred to the channel when the channel next selects the paging store in association with the chained command. The transfer of the displacement factor is conditioned on the timing of the channel selection relative to the accessibility timing of the displacement position. If the selection is late the response to the selection is delayed until a new factor is calculated. Such re-calculations will be relatively infrequent in a system which is not overloaded with channel contention activity.
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IBM Technical Disclosure Bulletin, vol. 13, No. 1, Jun. 1970, Transparent Roll Mode for Rotating Device, D. A. Stevenson.
Gruber Felix D.
International Business Machines - Corporation
Lieber R.
Mills John G.
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