Interface for amplifying logic signal from a signal line having

Details Interface for amplifying logic signal from a signal line having Interface for amplifying logic signal from a signal line having

1992-03-13

1993-01-12

Lee, Thomas C.

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3642385, 3642732, 3642735, 3642733, 3649227, 36492792, 36492794, 36492799, 364929, 364DIG1, 395500, G06F 126

Patent

active

051797100

ABSTRACT:
The disclosure pertains chiefly to an interface including an electrical supply. The disclosure concerns an interface capable of providing an external supply from the amplification of one of the signals. For example, the amplified DTR is used to give a supply voltage to a MIDI interface from an RS 232 serial interface using a nine-pin SUB D9M connector. The disclosure can be applied to the making of interfaces capable of giving an electrical supply to an external device as well as to computers including such interfaces. The disclosure can be applied chiefly to the making of computers capable of working under the MS-DOS operating system and capable of providing a supply voltage to the MIDI interface by means of an RS 232 serial interface and a SUB D9M connector.

REFERENCES:
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patent: 4578533 (1986-03-01), Pierce
patent: 4592069 (1986-05-01), Redding
patent: 4631698 (1986-12-01), Walsh et al.
patent: 4794525 (1988-12-01), Pickert et al.
patent: 4851715 (1989-07-01), Strong
patent: 4866602 (1989-09-01), Hall
patent: 4884287 (1989-11-01), Jones et al.
Electronic Design, vol. 31, No. 13, Jun. 23, 1983, pp. 166 & 168, Waseca, Minn., Denville, N.J. USA, W. Freeman, "Remote Display Draws Power from RS-232 Line".
David J. Comer, "Modern Electronic Circuit Design" 1968 Addison-Wesley Publishing Company pp. 187-190.

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