Information transfer system wherein bidirectional transfer is ef

Details Information transfer system wherein bidirectional transfer is ef Information transfer system wherein bidirectional transfer is ef

1980-06-27

1983-02-15

Springborn, Harvey E.

Boots, shoes, and leggings

G06F 300

Patent

active

043744290

ABSTRACT:
An information transfer system is described that includes a central processing unit (CPU) interconnected with a peripheral device such as an operator console by an interface bus of finite capacity. Transfer of information in the system is normally in a preferred direction from the CPU to the console. Provision is made to transfer information concerning key depressions on the console from the console to the CPU without using the bus by utilizing a normally continuously operating counter in the CPU that provides a sequence of coded count signals representative of individual keys that are provided on the console and that may be depressed. A comparator in the console compares coded count signals from the CPU counter with coded signals from the console representative of actual key depressions and provides a stop signal to the CPU counter via a single control line when an equal compare of the CPU counter and console coded signals occurs. The stopped coded count condition of the counter represents the actual key depressed. The CPU can then interrogate the current coded count state of the counter in the CPU at a convenient time to determine the actual key depressed and confirm that it has received the key depression information by operating indicators, such as visual and/or audible means in the console thus the interface bus capacity is not impacted by the transfer of the key depression information from the console to the CPU.

REFERENCES:
patent: 3795901 (1974-03-01), Boehm et al.
patent: 3834616 (1974-09-01), Washizuka et al.
patent: 4002842 (1977-01-01), Meyr et al.
patent: 4064560 (1977-12-01), Baxter
patent: 4075691 (1978-02-01), Davis et al.
patent: 4264984 (1981-04-01), Lovelace
patent: 4295124 (1981-10-01), Roybal

Affiliated with

Also associated with

Rating

Information transfer system wherein bidirectional transfer is ef does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Information transfer system wherein bidirectional transfer is ef, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Information transfer system wherein bidirectional transfer is ef will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1804415