Input/output port control

Details Input/output port control Input/output port control

1974-06-26

1976-12-07

Atkinson, Charles E.

Communications: electrical

Digital comparator systems

G06F 1300

Patent

active

039965643

ABSTRACT:
An input-output port control subsystem for use with a computer system having separate source and destination buses incorporated therein. Said system including circuitry for controlling operations of said system and said input/output subsystem, said subsystem including a bidirectional input/output bus for transferring data to and from said system, and separate gating means for selectively connecting said source and destination buses to said bidirectional I/O bus. External devices are connected to said bus thru an adaptor unit which is directly connected to said processing system by appropriate control lines. The input/output subsystem is adapted to operate either under programmed I/O control mode thru the central processing system or in cycle steal mode wherein the I/O devices themselves request cycle steal service time on the I/O bus thru their connected adaptor.

REFERENCES:
patent: 3363234 (1968-01-01), Erickson et al.
patent: 3411144 (1968-11-01), Rausch
patent: 3488634 (1970-01-01), Mager
patent: 3593302 (1971-07-01), Saito et al.
patent: 3643223 (1972-02-01), Ruth et al.
patent: 3668650 (1972-06-01), Wang
patent: 3745532 (1973-07-01), Erwin
patent: 3771136 (1973-11-01), Heneghan et al.
patent: 3821715 (1974-06-01), Hoff, Jr. et al.
patent: 3828326 (1974-08-01), Cash
patent: 3842405 (1974-10-01), Key et al.

Affiliated with

Also associated with

Rating

Input/output port control does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Input/output port control, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Input/output port control will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-382243