Pat4912627

° United States Patent [19] [11] Patent Number: 4,912,627 Ashkin et al. [45] Date of Patent: Mar. 27, 1990 [54] METHOD FOR STORING A SECOND 0104545 4/1984 European Pat. Off. . NUMBER AS A COMMAND ADDRESS OF A 59-52331 3/1984 Japan . FIRST PERIPHERAL DEVICE AND A THIRD - 1508854 4/1978 United Kingdom . NUMBER AS A COMMAND ADDRESS OF A Moheeee lose uted Kingdom - SECOND PERIPHERAL DEVICE 2035636 6/1980 United Kingdom . 2070826 5/1984 United Kingdom . a 4 . 0143160 6/1985 United Kingdom . [75] Inventors: Gant Glenda Gatos: Michael 2167274 5/1986 United Kingdom . ? . 0207313 1/1987 United Kingdom . [73] Assignee: Apple Computer, Inc., Cupertino, OTHER PUBLICATIONS ; Hill et al., “Dynamic Device Address Assignment [21] Appl. No.: 132,123 Mechanism”, IBM TDB vol. 23, No. 8, Jan. 1981, pp. [22] Filed: Dec, 14, 1987 3564-3565. 7 Search Report, dated May 21, 1986, for British Patent Related U.S. Application Data Application No. 8607632. sotct Primary Examiner—Thomas C. Le: 62] Di . No. 765,396, Aug. 14, 1985. ry © [62] ivision of Ser. No ue 9 Attorney, Agent, or Firm—Blakely, Sokoloff, Taylor & [51] Int. C14 GO6F 13/42 Zafman [52] U.S. Cl. 364/200; 364/229.2; 364/240.8; 364/261; 364/284.3; 340/825.52 [57] ABSTRACT [58] Field of Search ... 364/200 MS File, 900 MS File, 4 method for transferring data on a communication 364/514; 340/825.08, 825.07, 825.50, 825.52, medium between a host computer and a plurality of 825.22; 370/85 peripheral devices coupled to the medium at a plurality [56] References Cited of first address locations, including first and second U.S. PATENT DOCUMENTS 3,221,307 11/1965 3,646,534 3,715,725 3,787,627 3,836,888 3,863,025 3,979,723 4,063,220 12/1977 4,071,908 4,345,250 4,360,870 4,373,181 4,442,502 4,498,169. 4,562,535" 12/1985 4,568,930 Manning et al. . Miller ........ Kievit et al. .. Abramson et Boenke et al. Gonsewski et al. . Hughes et al. ... Metcalfe et al. .. Brophy et al. Jacobsthal McVey ...... Chisholm et al. Friend et al. Rozumus .. Vincent et al. Livingston et al. 2/1972 2/1973 1/1974 9/1974 1/1975 9/1976 1/1978 8/1982 11/1982 2/1983 4/1984 2/1985 2/1986 (List continued on next page.) 364/200 - 360/40 364/900 - 370/67 364/200 « 375/55 - 370/88 X 340/825.5 .-. 364/900 340/825.5 364/200 364/200 364/900. - 370/85 364/200 340/825.5 FOREIGN PATENT DOCUMENTS 0051425 5/1982 European Pat. Off. . ‘STO SENDING SET COLLISION tare Wective Tue AS SET cOLLisiON unre 73" peripheral devices at a one of the first address locations. The host computer transmits a plurality of first signals to the one of the first address locations requesting any peripheral devices at the one of the first address loca- tions to transmit data to the host computer. The first peripheral device senses the medium to determine if the medium is currently in use. The second peripheral de- vice senses the medium to determine if the medium is currently in use. The first peripheral device transmit data to the host computer when the medium is not in use.…