Bidirectional parallel protocol having computer indicates to the

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3642357, 3642601, 3642651, 364235, 364DIG1, 364930, 3649353, 395114, G06F 1300

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056665580

ABSTRACT:
A protocol provides bidirectional communication capability between a host computer and a printer over a parallel interface, the host computer and the printer having a forward channel therebetween for the transfer of signals from the host computer to the printer. The protocol includes conventions for turning the forward channel around so as to establish a reverse channel to allow transfer of data from the printer to the host computer, conventions for controlling the transfer of data from the printer to the host computer over the reverse channel, and conventions for turning the reverse channel back around so as to re-establish the forward channel.

REFERENCES:
patent: 4388686 (1983-06-01), Haid
patent: 4635222 (1987-01-01), Tokui et al.
patent: 4703450 (1987-10-01), Sueyoshi et al.
patent: 4720813 (1988-01-01), Kaneko
patent: 4745602 (1988-05-01), Morrell
I.B.M. Technical Disclosure Bulletin; "Query Printer Status"; vol. 33, No. 3B, pp. 88-89, Aug. 1990.
I.B.M. Technical Disclosure Bulletin; "Printer Interface"; vol. 26, No. 11, pp. 5783-5784. Apr. 1984.
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