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Now downloading free:xerox Alto Interfaces Nov78

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File name:Alto_Interfaces_Nov78.pdf
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Descr: xerox alto memos_1978 Alto_Interfaces_Nov78.pdf
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Alto_Interfaces_Nov78.pdfXEROX PALO ALTO RESEARCH CENTER Computer Science Laboratory April, 1973 - CSL Archieve # 3AL-038 retyped November 7, 1978 To: Alto Group From: C. Thacker Subject: Alto Interfaces This memo is in response to the request for a description of the Alto I/O system. Familiarity with the Alto is assumed 1 . . There are two basic ways in which I/O devices may be connected to the Alto. A device may appear to a program as one or more memory locations in the range 177000-177777, in which case it responds to addresses from MAR, for its selection, and transfers data on the memory data bus, MD(00)'-MD(15)'. Alternatively, a device may connect directly to the processor bus, and be selected by task-specific F1 or F2 signals. The latter interface will usually have its own task microcode, and will be us

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